It may be that the supercharger isn't reaching its efficiency range fast enough without some type of baxkpressure. This is definitely a documented issue when running a very free flowing exhaust with centrifugal Superchargers. What does the dynosheet look like and what type of Dyno was used?
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Old Car:GTM TSC'd 550whp / 410lbft tq @ 11.88PSI
New Car: Under Construction
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