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JL8Jeff · 11-28-2007, 07:19 AM

Do the free airbox mod and a ported TB and you might be at 12.5 or better. And that Flowmaster muffler is probably hurting more than helping. LS1's are pretty easy to do some basic mods with and see results. It's too late for you now!

Nice runs.

11-28-2007, 07:19 AM	#4
JL8Jeff Hippy Mod, Bergermeister Meisterberger, Moderator Join Date: Aug 2004 Location: Ewing Posts: 6,216 iTrader: (3)	Do the free airbox mod and a ported TB and you might be at 12.5 or better. And that Flowmaster muffler is probably hurting more than helping. LS1's are pretty easy to do some basic mods with and see results. It's too late for you now! Nice runs. __________________ 69 Z28 JL8 4 wheel disc brakes - being restored 09 Silverado Z71