Quote:
Originally Posted by Z OH 6
Stock manifolds on these cars are pretty restrictive, although there was a guy here making around 900whp through the stock manifolds on his CTS-V.
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Yeah they are worth 20-25whp, but it's the cat pipes that are the biggest restriction. Either way the bone stock exhaust has supported going 9's @ 140 mph in the 1/4 on these cars. Road course seems to kill the factory cats faster than 1/4mi.