You have those heavy a$$ rims on a car not known for its torque. Higher rotational mass is robbing your power. I would have just stuck with 19's. I don't see any logical reason to go larger than 19 on this vehicle. Wheels the size of a 19th century wagon don't have much of a place on modern cars, let alone a sports car. With the stockers being forged rays (sport), it only magnified the difference.
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Old Car:GTM TSC'd 550whp / 410lbft tq @ 11.88PSI
New Car: Under Construction
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