I had the exact same setup as you, and with the free mods at http://www.installuniversity.com/ins...sity/index.htm and I replaced my muffler with a straight through muffler, and I dropped a half a second in the 1/4 and gained 4 mph
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2000 z28
Mods: Free Mods, Granetelli Whisper Lid, Ghetto Dynomax Muffler(off my buddies Dakota RT)
Best Time: 13.4@106
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