Lukefriedman1 Posted December 11, 2018 Share Posted December 11, 2018 Is it okay to put a 4" cat back exaust on a 3" downpipe and cat? if not can anyone recommend any good 3" cat back exhaust's or a 4" Link to comment Share on other sites More sharing options...
Notorious Posted December 11, 2018 Share Posted December 11, 2018 4" cat back is overkill and no it will not fit a 3" down pipe, although anything is possible with exhausts if you're willing to pay for custom fabrication. Nobody makes 4" cat backs for the Legacy platform. You can find a lot of 3" exhausts. Avo, Invidia Q300, Magnaflow, etc. I run MeganRacing's OE-RS cat back with the quad tips which I recommend if you want a more refined rumble when you step on it but it is still quietly tame at idle. They are hard to find though. Link to comment Share on other sites More sharing options...
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