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Originally Posted by SophiaZ I have the Stillen HFC's and they took away back pressure and that left me with a hiss. I've seen on the Fast Intentions site for
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First and foremost go with our stainless steel muffler option and 18" resonators in the x pipe itself. As far as the high flow cats, ours are 300 cell just like the Berk as well as Stillen. However, we offer a resonated high flow cat that no one else does. What this does is give you a high flow cat and resonated test pipes all in one. The beauty is, they do not make any less power than our 300 cell high flow cats. The resonator is straight through perforated core and in my opinion will help cut down that hiss that you are hearing. It is there even when the exhaust is stock and if you listen real closely you can hear it ever so faint that it is. By removing the stock cats which use higher cell count cores and thicker exterior material, you eliminate what is absorbing most of that sound. All of the HFC's on the market are less restrictive than stock and much lighter because we use thinner wall tubing. This is why this sound becomes so much prevalent. If you have any questions, please do not hesitate to ask... Thank you, Tony
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