If I remember correctly Sam said that aftermarket exhaust do not give SC'd HR cars that much extra horsepower. Even though the engines share very many similarities you would have to ask him about your engine (VHR) though. I highly recommend some sort of meth injection to keep boost levels consistent in all types of conditions. GTM installed an HFS 3 on my car.
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Eibach, Tanabe, Blitz, Vertini, GTM stage 1.5 SC, Aquamist, Invidia, Alto built 5AT, Edge Racing, Racelogic, GTM driveshaft, 440 whp in 101F TX heat..
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