jackkelly Posted March 6, 2014 Share Posted March 6, 2014 Running a hybrid at 1.2 bar boost.Have a 2 and a 1/4 inch catback to a pro racer backbox.External wastegate with screamer pipe.Getting a catback to pro racer made up on Tuesday and I need to know will I go 3 or 2.5 inch? Quote Link to post Share on other sites
jackkelly Posted March 9, 2014 Author Share Posted March 9, 2014 bump Quote Link to post Share on other sites
DevonGT Posted March 9, 2014 Share Posted March 9, 2014 2.5 inch. Quote Link to post Share on other sites
RobSR Posted March 10, 2014 Share Posted March 10, 2014 Id go for 3" in nearly all instances larger the better for turbos, better spool, lower EGT's etc. Quote Link to post Share on other sites
mikey4410 Posted March 10, 2014 Share Posted March 10, 2014 would have to agree with bigger the better. you need as little back pressure as possible.ideally none on a turbo as they dont require it like a n/a does. Quote Link to post Share on other sites
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