Thread: GM performance headers and exhaust: what kind of performance increase?
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Old 05-14-2009, 05:37 PM   #15
THE EVIL TW1N
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Drives: 2003 Cobra Convertible
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Quote:
Originally Posted by Shocker View Post
297/316 stock

309/329 shorties

337/351 LT's
but with the LT's you did the exhaust piping too, right?

and with the shorties, did you do the rest of the exhaust as well?

and were these both including a tune?
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