I'm making 327/270 on that same dyno in similar conditions with a CAI, RTP's, CBE, and a tune in 4th gear. 5th gear would have been around 335WHP. Did you remove the sleeve frm the intake? MArtin is an awesome tuner.
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Old Car:GTM TSC'd 550whp / 410lbft tq @ 11.88PSI
New Car: Under Construction
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