Quote:
Originally Posted by chevy72blu
for a mild to moderate LS1... I'd go 2.5. In my experience, LS1's actually like a little backpressure. Most modern engines seem to be designed this way.
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In my Camaro....I ran Kooks headers with a 3.5in primary, into a Mufflex 4in Y-pipe and 4in through to the back where there was a Dynomax Bullet muffler, then Y'd off into dual 3in over the axle and out the back.