Why Not to Change Your Car's Muffler

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  • Published: 18 May 2018
  • Muffler explained and why not to change or modify the one that comes with your car's exhaust system. Why not to change your car's muffler with Scotty Kilmer. Muffler modifications and aftermarket mufflers. Stock muffler vs straight pipe vs muffler delete, which is better? The pros and cons to modifying your exhaust system and muffler. There are advantages to changing a stock muffler, but also a lot of downsides. If you haven't made any major engine modifications to your car and don't plan on reprogramming the car's computer, changing the muffler on your exhaust system isn't a smart idea. DIY car repair with Scotty Kilmer, an auto mechanic for the last 50 years.

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Comments • 4 888

  • Scotty Kilmer
    Scotty Kilmer   1 years back

    ⬇️Scotty’s Top DIY Tools:
    1. Bluetooth Scan Tool: http://amzn.to/2nfvmaD
    2. Cheap Scan Tool: https://amzn.to/2D8Tvae
    3. Professional Socket Set: http://amzn.to/2Bzmccg
    4. Wrench Set: http://amzn.to/2kmBaOU
    5. No Charging Required Car Jump Starter: https://amzn.to/2CthnUU
    6. Battery Pack Car Jump Starter: http://amzn.to/2nrc6qR


    🛠Check out my Garage to see what I use every day and highly recommend:
    https://www.amazon.com/shop/scottykilmer

    ► Subscribe and hit the notification bell for all new videos: https://www.youtube.com/user/scottykilmer

    Scotty on Social:
    Facebook ► https://www.facebook.com/scottymechanic/
    Instagram ► https://www.instagram.com/scotty_the_mechanic/
    Twitter ► https://twitter.com/Scottymechanic?lang=en

    • Alejandro Palazuelos Leis
      Alejandro Palazuelos Leis  4 hours back

      Hello Mr.Scott I have a cuestion, I have a motorcicle and I use it not to often and my cuestion for how long you can keep the same gas and use it the bike with same gas with out damage the engine? thanks.

    • Ariel Gallego
      Ariel Gallego  4 months back

      Hey Idol Scotty, what if I use the stock muffler and change the tip to a bigger size? Should the comp box be re-tune? I hope you reply on this. thanks idol!

    • Intelligent Horse
      Intelligent Horse  5 months back

      @DuDeZoNe How?

    • DuDeZoNe
      DuDeZoNe  5 months back

      @Intelligent Horse highly Informative! Mostly incorrect tho

    • Ricardo Forworth
      Ricardo Forworth  6 months back

      Is it a good idea to straight pipe an 89 Bronco

  • DJohn NineOneSix
    DJohn NineOneSix  3 days back

    I own a Honda EJ8.
    I swapped the muffler.
    Not for a fart can.
    I get install a Magnaflow mild muffler that opens a bypass flap when I step hard on the gas pedal.
    And it doesn't sound like a weed eater or a fart..
    No. Problems at all.
    No check engine light and I gained some extra mpgs.
    Anyways I run my own mix of gasoline E23.
    Hondas ECU's learn.
    The sensors sense the differences and suppose to compensate it to run the correct map.
    Of course sometimes you have to take the car to the tuner.

    • Alexander Bautista
      Alexander Bautista  3 days back

      Pucta q vergueo tiene este pisado jajajaja

      • TK Tails ODESSYE4
        TK Tails ODESSYE4  6 days back

        I like ur logic but this generation of 2019 we just love doing things with our cars it give us an adrenaline and makes feel proud and confident with what we can and love to do

        • Glenn Quagmire
          Glenn Quagmire  1 weeks back

          Next, why You Should Never get Married 👰💒 The wife takes all your freedom🏄 is a money pit💰 you only get sex 💖once a month📆 if you're lucky 🎲🎲 Then you still have to celebrate Valentine's day, Anniversary, birthday, Christmas, gifts 🎁, dates and that's all your money goes, and then she gets really mad if you change your muffler 💨 before buying her a ring 💍 😂😂

          • Gospel Guitarist
            Gospel Guitarist  1 weeks back

            I put a borla exhaust and it feels goooooooooooooooood :)

            • Samuel Karlsson
              Samuel Karlsson  1 weeks back

              Thats not true, in part throttle driving ecu knows air/fuel ratio from exhaust. But when you are full throttle then you need more fuel. Fuel economy is better with free flow exhaust. Image you are going for maraton race and you cant breath out so then you die.

              • Building Experiments
                Building Experiments  1 weeks back

                Next video: “why not buying a car is destroying your car”

                • Peter Polizzo
                  Peter Polizzo  2 weeks back

                  Live a little

                  • lilsuper242
                    lilsuper242  2 weeks back

                    I have a 94 Toyota Corolla. Would i be causing damage if I replaced the muffler with a catback?

                    • WooferJr
                      WooferJr  1 weeks back

                      It's a 94 Toyota Corolla, it ain't worth no more than $500. You'll probably be spending more doing a catback than what your car is actually worth. Just do whatever.

                  • MIGO Kutz93
                    MIGO Kutz93  2 weeks back

                    Next video :

                    bumper stickers “don’t do it !!”

                    • DukatiDoctor TARDIS
                      DukatiDoctor TARDIS  2 weeks back

                      My car has a carburetor. It didn’t come with any sensors, a catalytic converter, or any computer whatsoever. ...so can I take the muffler off?

                      • joseph garcia
                        joseph garcia  2 weeks back

                        Scotty I like my new
                        Flow master in my Chevy Silverado it sounds beast .......👍

                        • Tan man
                          Tan man  3 weeks back

                          Installed new cool exhaust today, didn’t help the performance, drones, I’m miserable. Or too old now.

                          • My World 101
                            My World 101  3 weeks back

                            Guys leave this guy alone he's living in nostalgia he's old and anything new and a mod to a car is bad for him.

                            • Matt Swank
                              Matt Swank  3 weeks back

                              A catback won't cause these issues..since you are leaving the cat alone..no tune needed because it isn't changing any air/fuel mixtures.

                              • Jace Dickens
                                Jace Dickens  3 weeks back

                                Or ya know set up the system and tune it to run it pretty much as he stated at the end, that's what I'm doing as I'm building a car up new intake and exhaust and then a tune once that's set up

                                • Daniel Rivera
                                  Daniel Rivera  3 weeks back

                                  I don't think he can still hear correctly since hes always screaming haha

                                  • Lester Andino
                                    Lester Andino  3 weeks back

                                    Honda🐝Power

                                    • DJ Johnson
                                      DJ Johnson  3 weeks back

                                      What about our big lifted trucks with the borla exausts, flowmasters cats, and long tube headers

                                      • Dqem
                                        Dqem  3 weeks back

                                        So I take that you should just make sure to change the computer so the fuel injectors etc put out right

                                        • Colin Morand
                                          Colin Morand  3 weeks back

                                          Don’t change anything ! Just imagine what it’s like living with Scotty- Nothing interesting allowed and no Fun !

                                          • Ram Valdez
                                            Ram Valdez  3 weeks back

                                            So so you hate all things done to a car cause sounds like you just conplane way to much sir and is very negative stop putting people down for having cool rides

                                            • Bmx er R
                                              Bmx er R  3 weeks back

                                              If you want to take the fun out of a car and have less power keep your stock exhaust

                                              • Bilal Ahmed Qazi
                                                Bilal Ahmed Qazi  3 weeks back

                                                U r great scotty. Thanks :-)

                                                • Boudreau Guitars
                                                  Boudreau Guitars  3 weeks back

                                                  Hate them fart cans!

                                                  • Shattered Knight
                                                    Shattered Knight  3 weeks back

                                                    But mine broke. 2003 Eclipse. All rusted. Pipe from muffler to rear resonator isn't even connected. So nothing even goes through the muffler.

                                                    • thedudeguy1
                                                      thedudeguy1  3 weeks back

                                                      Why not to be a car enthusiast

                                                      • Bikram Mann
                                                        Bikram Mann  4 weeks back

                                                        Watching this right after ordering Axlebacks for my mustang ... lol

                                                        • Mark Wheeler
                                                          Mark Wheeler  4 weeks back

                                                          Great advice Scotty! I love your enthusiasm about cars!

                                                          • AJ Rugo
                                                            AJ Rugo  4 weeks back

                                                            Scott should change his intro to...
                                                            "Rev up your stock, muffled-exhaust engines!!...

                                                            but not too much because you could blow it up especially if it's not my Toyota Celica, my wife's Lexus or my Motorcycle."

                                                            • ORC 06
                                                              ORC 06  4 weeks back

                                                              Why you shouldn’t rev up the engine in your CARRRR

                                                              • Deep Sights
                                                                Deep Sights  4 weeks back

                                                                Scotty is boring no intake, no muffler, no headers lol his the type of dude to drive all slow when 50 is the speed limit

                                                                • David Davis
                                                                  David Davis  4 weeks back

                                                                  It's called tuning. My 91 ZR1 was tuned by Marc Haibeck. Being the car has a chip Marc makes a chip special for all the mods done to the car. Including a special provision so that it will not back fire when you let off the throttle suddenly. The exhaust sounds awesome and he prefers to use the Corsa system. Corsa uses a center muffler / resonator that uses gases to cancel out loud drone at lower engine speeds but opens up at wide open throttle. Marc does his homework and excellent tuning.

                                                                  • Walt Moore
                                                                    Walt Moore  4 weeks back

                                                                    Scotty this is America the land of the free and home of the brave let the cars have sum fun come on man

                                                                    • Luke Emms
                                                                      Luke Emms  4 weeks back

                                                                      Because Scotty don’t like it

                                                                      • James Wright
                                                                        James Wright  4 weeks back

                                                                        You can reprogram a car too so what's the difference between me doing exhaust work and reprogramming the car vs you doing it to your motorcycle? It's ok for your bike but not the car.....got it 🙄

                                                                        • hiphopcroaks24
                                                                          hiphopcroaks24  4 weeks back

                                                                          Forehead so big it has it's own gravity well

                                                                          • rolandhazard1
                                                                            rolandhazard1  4 weeks back

                                                                            Scotty is lame

                                                                            • pood si
                                                                              pood si  4 weeks back

                                                                              Watched this video today installed a new muffler (cherry bomb) enhanced pipes and a cool flow system, this guys crazy.

                                                                              • Joe Young
                                                                                Joe Young  4 weeks back

                                                                                Too much time on the motorcycle made Scotty def that's why he screams, lol.

                                                                                • I'm Not A Car Guy
                                                                                  I'm Not A Car Guy  1 months back

                                                                                  Fart cans are not for cars

                                                                                  • Brothers In Arms Sports
                                                                                    Brothers In Arms Sports  1 months back

                                                                                    This dude is a gooooooooooobbbbeeeeerrrrr

                                                                                    • Kevin Barruga
                                                                                      Kevin Barruga  1 months back

                                                                                      What’s up with the 101st ABN decals?

                                                                                      • Michael K. Lee
                                                                                        Michael K. Lee  1 months back

                                                                                        die

                                                                                        • arjay crystal
                                                                                          arjay crystal  1 months back

                                                                                          long story short. Get a tune before messing with the exhaust system?

                                                                                          • Marcus Bralic
                                                                                            Marcus Bralic  1 months back

                                                                                            My Integra runs the same. Im not an expert on ecus but it still has the o2 sensor and cat sensor. Hondas do sound better.... let us little horsepower guys dream scotty . But you are the most awesome honest dude and there are not many good people like you these days.

                                                                                            • Philip Turner
                                                                                              Philip Turner  1 months back

                                                                                              Personally I hate all the attention seeking juvenile little baby idiots with loud cars that annoy us all and damage hearing