HFCs in my experience add some rasp at high RPMs. I'm running Berk HFCs and a non-resonated Fast Intentions CBE with carbon fiber mufflers. Its loud, but I LOVE it.
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~Rob 
-DD Air Guide, Stillen G3 CAIs, 63mm Throttle Bodies, Motordyne M370, Berk HFCs, FI TDX CBE (non-res, CF), Sprint booster v3, Ecutek Dyno Tuned, and the list goes on...
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