Quote:
Originally Posted by LS3 SS
Zero. The factory exhaust is 2.5'', and flows pretty well. There is almost no gain to be had in 2.5'' exhaust. 3'' is overkill on an N/A motor unless you have some bigger cubes, high flowing heads and a beastly cam.
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IIRC the stock system is good to ~600RWHP. Then the 3" is not just for sound anymore.
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