Idk, I like my pulley's. 7k miles. Not additional vibrations, improved mileage, revs faster, and gained 7-10whp throughout the rpm range. Worth every penny in my personal opinion, but this is a continuing argument on this forum so I won't go further.
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Old Car:GTM TSC'd 550whp / 410lbft tq @ 11.88PSI
New Car: Under Construction
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