They look like F.I. knock off's, but they are a new option. I have PPE's myself. PPE's seem to have a higher pitched sound and need resonators to help with rasp, but the gains are at least on par to F.I's LTH option. I wouldn't waste my time with shorties.
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Old Car:GTM TSC'd 550whp / 410lbft tq @ 11.88PSI
New Car: Under Construction
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