I don't get hissing on decel with my LTH's. Not sure about the F.I. headers. I only get a small hint of rasp, but its masked by scavenging. It might originate from the factory header design, idk, I'm only guessing from my limited experience.
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Old Car:GTM TSC'd 550whp / 410lbft tq @ 11.88PSI
New Car: Under Construction
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