This Illegal Mod Will Add 200 Horsepower to Your Car

  • Published: 23 October 2019
  • This Illegal Mod Will Add 200 Horsepower to Your Car, DIY life hacks and car repair with Scotty Kilmer. Banned car modifications. Muffler delete. Car life hacks. How to make car run better. Illegal car modifications. How to remove muffler to make car run better. Why it's illegal to delete the muffler and straight pipe your car. How mufflers work. Car Advice. DIY car repair with Scotty Kilmer, an auto mechanic for the last 52 years.

    ⬇️Scotty’s Top DIY Tools:
    1. Bluetooth Scan Tool:
    2. Mid-Grade Scan Tool:
    3. My Fancy (Originally $5,000) Professional Scan Tool:
    4. Cheap Scan Tool:
    5. Basic Mechanic Tool Set:
    6. Professional Socket Set:
    7. Ratcheting Wrench Set:
    8. No Charging Required Car Jump Starter:
    9. Battery Pack Car Jump Starter:

    ⬇️ Things used in this video:
    1. Common Sense
    2. 4k Camera:
    3. Camera Microphone:
    4. Camera Tripod:
    5. My computer for editing / uploading:

    🛠Check out the tools I use and highly recommend ►

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    This is the people's automotive channel! The most honest and funniest car channel on YouTube. Never any sponsored content, just the truth about everything! Learn how to fix your car and how it works. Get a chance to show off your own car on Sundays. Or show off your own car mod on Wednesdays. Tool giveaways every Monday to help you with your own car projects. We have a new video every day! I've been an auto mechanic for the past 50 years and I'm here to share my knowledge with you.

    ►Here's our weekly video schedule:
    Monday: Tool giveaway
    Tuesday: Auto repair video
    Wednesday: Viewers car mod show off
    Thursday: Viewer Car Question Video AND Live Car Q&A
    Friday: Auto repair video
    Saturday: Second Live Car Q&A
    Sunday: Viewers car show off

    ►Second Daily Upload Every Afternoon of Live Car Q&A videos as well!

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Comments • 1 418

  • Scotty Kilmer
    Scotty Kilmer   3 weeks back

    6 Worst SUVs Only Stupid People Buy:

    ⬇️Scotty’s Top DIY Tools:
    1. Bluetooth Scan Tool:
    2. Mid-Grade Scan Tool:
    3. My Fancy (Originally $5,000) Professional Scan Tool:
    4. Cheap Scan Tool:
    5. Basic Mechanic Tool Set:
    6. Professional Socket Set:
    7. Ratcheting Wrench Set:
    8. No Charging Required Car Jump Starter:
    9. Battery Pack Car Jump Starter:

    ⬇️ Things used in this video:
    1. Common Sense
    2. 4k Camera:
    3. Camera Microphone:
    4. Camera Tripod:
    5. My computer for editing / uploading:

    🛠Check out the tools I use and highly recommend ►

    🔥Scotty Shirts and Merch ►

    Subscribe and hit the notification bell! ►

    Scotty on Social:
    Facebook ►
    Instagram ►
    Twitter ►

    • Michael Pearce
      Michael Pearce  6 days back

      The muffler people still claim that you do need a muffler for back pressure to keep your exhaust valves from burning. It didn't seem to make sense to me but I don't know a lot about engines but do work on my 72 Chevy El Camino which I purchased February 15th 1975 and 94 GMC.

    • Ryan Dronsfield
      Ryan Dronsfield  2 weeks back

      Scotty back fire on performace cars could be anti lag or 2 step lanch control

    • big daddy's house
      big daddy's house  2 weeks back

      Is it illegal if I just remove the muffler bearings? 😉

    • Bv791510
      Bv791510  3 weeks back

      Hey Scotty, my mechanic says my 2003 GMC Sierra 1500 5.3 L V8 with 125,000 miles will need a new or rebuilt transmission soon. Is it worth it to replace or rebuild the transmission?

    • Abdelkader Labidi
      Abdelkader Labidi  3 weeks back

      Hi Scotty,
      I have an Infiniti g25 2014,it has 40000 KM,please I want to check the transmission fluid level but I can’t locate the dipstick,and mayo know how often I need to change it’s oil?!

  • Martin Garcia
    Martin Garcia  5 hours back

    yeah, with this guy waving in planes I get a bit sick to my stomach, LOL

    • oldskoowl & pebbles travels

      yep same in Western Australia Scotty but what they can't see can't hurt them LOL

      • Marlon Alberto Rodriguez
        Marlon Alberto Rodriguez  17 hours back

        People say my voice is muffled and I do suffer from asthma. Makes sense, I'm not having good oxygen flow. I'll ask my doctor to remove my catalítico out my throat.

          POOPY PUPPY PRODUCTIONS  21 hours back

          I'm almost 70 years old now. In 1970, I bought a 1967 Shelby GT500 and had a blast with it. Now-a-days, I don't shive-a-git. I have fun now driving the speed limit (or less) and regardless of which lane I am in or where I'm going, I like to keep my LEFT TURN SIGNAL ON. LOL

          • Tommy !
            Tommy !  2 days back

            I removed my exhaust back box ( muffler) and took the cat out, car's quicker but put the back box back on coz it's to noisey but left the cat off.

            • 1200sbeemer
              1200sbeemer  2 days back

              One of the funniest things I’ve ever seen, years back I saw a plastic newspaper mailbox mounted upside down on this guys El Camino for his hood scoop. It was painted but you could still see the name of the newspaper’s emblem.

              • NaeMuckle
                NaeMuckle  2 days back

                The back fire in modern sports cars is done electronically on purpose to make it sound cool.

                • W. Rusty Lane
                  W. Rusty Lane  3 days back

                  I'll bet you couldn't talk if someone cut off yer arms.

                  • Paul Rice
                    Paul Rice  3 days back

                    Just get an electric ⚡️ car 🚗 and use the muffler to call cows 🐄

                    • 2 Tall
                      2 Tall  3 days back

                      shut up already

                      • HENZEK1
                        HENZEK1  3 days back

                        4:33 That is a 4-stroke Honda knock off engine.
                        Not a 2-stroke!

                        • Mike England
                          Mike England  3 days back

                          If you tie his hands could he still talk?

                          • Doug Antelman
                            Doug Antelman  4 days back

                            Removing your cars muffler is just stupid. Get a high performance muffler with better flow

                            • karbinunit
                              karbinunit  4 days back

                              How do you cope when driving though the different states, if your car is legal in your own state but not in the states your driving through!?

                              • Cambodia
                                Cambodia  4 days back

                                Never knew muffler, muffle sound of vehicles. Lol. Thanks for the definition Scotty

                                • Christopher Olszewski
                                  Christopher Olszewski  5 days back

                                  Vehicles don't need back pressure but it's been proven the design of collectors and exhaust manifold have what's called a scavinging effect Which most factory exhaust incorporate slightly

                                  • Cars and Fun
                                    Cars and Fun  5 days back

                                    Wanna know a kicker? Theres no such thing as back pressure, at least, not for normal cars, its more applicable for race cars, just like aerodynamics, it hardly plays a roll in fuel economy unless you are doing 140+ mph

                                    • Dewayne Thomas
                                      Dewayne Thomas  6 days back


                                      • WARPAINT GAMER
                                        WARPAINT GAMER  6 days back

                                        i backfire at least 2 times a day.

                                        • Adam c
                                          Adam c  6 days back

                                          You can also replace the muffler bearings and headlight fluid!

                                          • Phill Huddleston
                                            Phill Huddleston  6 days back

                                            One of these days he will reveal how he boosts his energy though from the look of it it may or may not be legal :(

                                            • No lights, no water, no late night snacking.

                                              1:43 the sound my cat makes when she wakes up at 3am and wants to be fed.

                                              • Ender
                                                Ender  6 days back

                                                I thought reducing backpressure cause more heat to flow through the exhaust port, isn't that why they sometimes use sodium filled exhaust valves?

                                                • Joe Rogers
                                                  Joe Rogers  6 days back

                                                  one in correct statement. The V4 engine you mentioned was a 4 stroke. It came after the 3 cylinder two stroke engines that Saab first used. I had a saab with a v4 4 stroke engine.

                                                  • Samuel S.
                                                    Samuel S.  7 days back

                                                    Many loud cars in NYC-NY State. DMV or law enfroment doesn't bother unless someone complains.

                                                    • Joshua K
                                                      Joshua K  7 days back

                                                      "The legality is a no man's land!!!" LMFAO!!!

                                                      • Joshua K
                                                        Joshua K  7 days back

                                                        This dude is like my new favorite youtuber, always hated working on cars an trucks til i started seeing this dudes videos an saw him change brakes with one hand!! Lmao! Was like wth!!! Awesome vids!

                                                        • Gary
                                                          Gary  7 days back

                                                          Back fire is through the intake after fire through the exhaust! Just to be technical.

                                                          • mc cass
                                                            mc cass  7 days back

                                                            Scotty, in modern vehicles, will an ECU push more fuel when you 'open up' the exhaust/intake?

                                                            • scoobydubin
                                                              scoobydubin  7 days back

                                                              They don’t even emission test cars in Michigan lol

                                                              • Junior Lopez
                                                                Junior Lopez  1 weeks back

                                                                Thank you Scotty for ALL YOUR AWESOME VIDEOS 👍😀🙂🙃

                                                                • MJCLAXDEN
                                                                  MJCLAXDEN  1 weeks back

                                                                  The Sonett you posted was actually the Sonett III, not the V-4, 2-stroke. Loved the video, but I just wanted to make you aware that was the Sonett III (1970-74) version.

                                                                  • Bradley Barton
                                                                    Bradley Barton  1 weeks back

                                                                    No replacement for displacement.

                                                                    • smokeyfgg
                                                                      smokeyfgg  1 weeks back

                                                                      i love the straight pipe on my bora. that pewwwwwwww noise :P

                                                                      • Dennis Cale
                                                                        Dennis Cale  1 weeks back

                                                                        Love ur post and casts

                                                                        • lochinvar00465
                                                                          lochinvar00465  1 weeks back

                                                                          On my old Chevette, the muffler was originally oval, but it transformed into a round one with oval ends. That thing sure could backfire.( It had a bad camshaft alignment) It also only got 13 mpg. Then the camshaft broke and had to be replaced. And with a new cam, properly aligned, the gas mileage doubled and performance drastically increased and the backfiring disappeared.. Once coming out into the street I floored it and burned rubber clear across Main Street.

                                                                          • Godisknocking 777x7
                                                                            Godisknocking 777x7  1 weeks back

                                                                            I think I missed the main point of how I can gain 200hp on an illegal mod.
                                                                            There's a lot of info on how an engine works to be efficient but no details on the mod.

                                                                            • MISTA 808
                                                                              MISTA 808  1 weeks back

                                                                              I'm confused. If I take off the muffler from my 2006 Audi S4 it would go from 350 to 550 horse power? 🤣

                                                                              • Paul Lee
                                                                                Paul Lee  1 weeks back

                                                                                200 HP MOD!!!! LIER

                                                                                • John Line
                                                                                  John Line  1 weeks back

                                                                                  Do you not know that Ferrari’s and Porsche’s are tuned like the race car they are supposed to be. If you own a Ferrari, and race it or do high speeds in it, congrats to you, they are supposed to backfire. Scotty, just shut the hell up and go to an actual mechanic school

                                                                                  • Cadens Corner
                                                                                    Cadens Corner  1 weeks back

                                                                                    Painted flames give an extra 20% hp.

                                                                                    • stangmaster 2
                                                                                      stangmaster 2  1 weeks back

                                                                                      What's with the Joe Cocker movements?

                                                                                      • Jared Hunnicutt
                                                                                        Jared Hunnicutt  1 weeks back

                                                                                        They do ZERO emission checks here in Florida. Thank God I live the very heart of WAY NORTH Florida. Politics around here are like East Texas, Louisiana, Mississippi, BAMA, and Georgia. It’s very Southern and Conservative (born and raised here, my kin have been in the area since the 1840’s, back in the 1800’s my ancestors had 10,000 acres. Now it’s down to 720 acres in the family [1 SQ Mile is about 640 acres so we’re good]). We have pavement, a long range shooting range, and we STILL raise Brahmin Cattle just like my kin for almost 180 years ago. Cool Conservative Yanks are welcome. Liberal Yanks from NY, NJ, MA, Cali, etc STOP infiltrating the South and YOUR demonic “politics” (baby killers). BTW I love my K20 in my Civic SI Sedan!

                                                                                        • sienile
                                                                                          sienile  1 weeks back

                                                                                          For under $100 you can get high performance mufflers that you can see through, just like a straight pipe, but still have perforations and sound deadening. I went from straight pipes to a Borla ProXS muffler with no loss of power, but 80% quieter exhaust at normal driving RPMs while still retaining the loud wide open that the straight pipes gave.

                                                                                          • jacob haussmann
                                                                                            jacob haussmann  1 weeks back

                                                                                            My Toyota sellacar

                                                                                            • smobag
                                                                                              smobag  2 weeks back

                                                                                              7:02 Biarritz Blau 5!!!!

                                                                                              • Phantom0fTheRouter
                                                                                                Phantom0fTheRouter  2 weeks back

                                                                                                That "bizarre 2 stroke, 4 cylinder that the Swedes made" was NOT. The V4 in the SAABs was the 4 stroke German Ford Tannus V4. The 2 stroke that the Swedes used BEFORE the Ford V4 was a 841cc Saab 2-stroke Inline 3 cylinder engine.