Well, I'm running Berk HFCs right now and can tell you that even with HFCs there's a hiss. And when I had a 350 I ran Kinetix resonated test pipes, and there was a hiss. So I wouldn't worry about it too much just yet. But I guess it's a question of degree. i.e., how much hiss...the magnitude of the hiss.
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"There are no small accidents on this circuit." -- Ayrton Senna
316.8whp & 248 ft/lbs (Dyno Dynamics) | 319whp & 256 ft/lbs (DynoJet) (04/23/10)
Stillen G3 CAI, CBE, Pulley / F.I. LTH / GTSpec Ladder Brace / Setrab Oil Cooler / UpRev-tuned by Forged Perf.
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