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04-27-2015, 09:32 PM
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#15 |
 
Drives: Scion xA Join Date: Oct 2009
Location: Virginia
Posts: 449
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3" even at lower boost and power levels will still be more efficient than a 2.5". Even when I had a tiny turbo and less than 200whp, I switched from 2.25'' to 3'' and it was a 17whp improvement. My xB ( which I sold 2 months ago) was 319whp with a 3" exhaust, I then put back the 2.25" Borla to quiet it down for daily use and it was pulling teeth trying to tune it past 270whp. Huge difference, and also because on the same wastegate spring we couldn't get the same boost with the boost controller maxed out... do to the exhaust back pressure.
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