My AEM's paired with pulley's untuned and broken O2 sensors gained 16whp on top of the full exhaust. Had things been running perfectly and with tuning, I don't doubt the gains would have been 25 or more. Unfortunately I didn't know about the O2 issue until after FI so no info on after it was fixed NA.
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Old Car:GTM TSC'd 550whp / 410lbft tq @ 11.88PSI
New Car: Under Construction
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