arkadyzv Posted April 6, 2009 Share Posted April 6, 2009 Last weekend I installed my sti up-pipe and gutted my stock DP, I ended up leaving the last cat in place. I got an open source road tune and the car feels a lot better. I also have an x02 catback, so my question is , is there any performance gain in gutting the 3rd cat in the midpipe? The smell isn't an issue as I've had 2 rx7's so yeah. Link to comment Share on other sites More sharing options...
arkadyzv Posted April 9, 2009 Author Share Posted April 9, 2009 bump, anyone? Link to comment Share on other sites More sharing options...
smokedoutv6 Posted April 9, 2009 Share Posted April 9, 2009 i think any gains are minimal since the 3rd cat isnt as restrictive. from what i've read its mostly a smell issue with minimal gains (if any) by removing the 3rd cat. Link to comment Share on other sites More sharing options...
arkadyzv Posted April 10, 2009 Author Share Posted April 10, 2009 Can anyone verify any gain whatsoever , as minimal as it may be? Link to comment Share on other sites More sharing options...
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