No tune? Sounds like a high-reading dyno. My understanding was most stock z’s make ~275. Even if you’re off by 15, that still sounds pretty high without a tune.
What year is it? The exhaust manifolds changed in’15
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‘13 6MT - Ported upper/lower intake manifolds and TBs, AAM intake, Dewla Dezign Air Guide, ARK HFC, FI 18” res CBE
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