greetings..
okay, here goes nothing..
i had install a single muffler to the ms3 2011..a couple of other ms3 owner doesn't agree to what i just did. so the question is, did i just ruined the exhaust system? so far, from my driving experience the car goes just well and zoom much faster after the installation. its a custom 3'' piping after the downpipe with a custom muffler. straight flow. i just had to know if what I've done is wrong.