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The dyno numbers coming out for the gt500 need to be properly accounted for by ditching traditional drivetrain loss calculations. The carbon fiber drive shaft will take less hp to spin and this will become a linear function as rpms climb higher.
It's safe to assume that 15% loss is over calculated. It's likely closer to 12.5% loss because of this. I'd guesstimate the 5.8 is slightly underrated and makes an honest 685 fly wheel hp on an engine dyno fully dressed with tail pipes and accessories.
That's factoring 610whp which some have gotten while others got 601, and 613.
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Silver 03 cobra coupe
-Full mm/ftbr chassis, built irs/t56, 3.73s, trutrac
-Braces, 6pt, flsc's, brembos, rotary forged sochi's
-9.3/1 Livernois 5.3 modular, Diamond, Carrillo etc
-FGT heads stage 3 PnP'd, MMR stage 3 turbo grinds
-FR500c, custom split maf dual inlet, single blade etc
-Comp 62/65 T4's 3xbb, oil/water cooled, blankets etc
-CG Fab. ff headers, custom 3" hotside, Tial wastegates
-Dual in/out 3" cold side, Tial bov's, Truboost, SCT, NGk
-Custom 8qt oil, dual 405s return fuel with id2000's, etc
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