Quote:
Originally Posted by reldas
i currently have stillen hfc and FI exhasut and i get the hiss on decel and a hiss on high load accel. i am going to swtich my HFC to FI resonated HFC to try fix it a bit. becaus eon accel the hiss is extremely annoying. and i got my mechanic to look it over and there are no leaks
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It's not going to fix it. I had resonated cat pipes and resonated test pipes. You're better off using exhaust wrap, that will minimize it.