Looking at the graph I can definitely tell the old one did not have that intake manifold. Looking at your exhaust mods, nothing there will prevent you from making power all the way to 8k. I'm still unsure how dramatic of an effect the intake manifold has on full bolt on cars like mine and yours (yet to dyno under exact conditions). I would definitely check to make sure your filters are clean. It looks eerily similar to how the stock intakes choke up after 6500 rpm and flat line. Don't count out the M370 though. I have one on mine and I'm showing power loss up top, but not sure how much if I were to switch to 93 on the rollers.
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Old Car:GTM TSC'd 550whp / 410lbft tq @ 11.88PSI
New Car: Under Construction
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