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    Thread: Audi TT 225 Exhaust Size? 2.5" or 3"

    1. 02-11-2008 10:27 PM #1
      I currently have a 225 tt and just installed a 42dd 3" downpipe, would it be better to run it through a 2.5" exhaust system or a 3"? Any kind of help will be appreciated!

    2. 02-11-2008 10:53 PM #2
      Stock is a combination or crushed 2.5" piping. You can go with a 2.75-3" aftermarket catback. Both will give about the same gains and the 3" will be louder

    3. 02-11-2008 11:02 PM #3
      I was thinking of doing a 3" custom all the way and probably doing a resonator so its not crazy loud.

    4. 02-11-2008 11:20 PM #4
      the car sounds like a tractor will strait pipes. You will need atleast a muffler to keep a quality sound. The strait throughs are not a restriction and will keep a nice deep note. Magnaflow and borla are the best matches

    5. 02-12-2008 09:37 AM #5
      Poke around on youtube. There are many combinations out there. I like the 2.75 catback systems from Blueflame and Jetex best. Unless you're going big turbo, anything over 2.75 is less beneficial and "bother the neighbors/attract police" loud anyway.

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