Originally Posted by bmarcinczyk14 (Post 135461)

if i were to buy the FI carbon fiber catback exhaust system with the FI hfc's and stillen headers, would you recommend getting the 18 inch resonators rather than the 12 inch to quite the car down considering the headers will make it louder? will the 18 inch res. keep rasp at a minimum compared to the 12 inch?

Originally Posted by FuszNissan (Post 135931)

I have the Berk HFC's with stock exhaust and it's on the louder side of my taste.

Originally Posted by dszombiex (Post 136143)

Pics are up in my albums.

Originally Posted by ZforMe (Post 136210)

Are those 18" resonators?

Originally Posted by bmarcinczyk14 (Post 136118)

tony, i would be great if you can answer the question i posted earlier, and this one. which one is louder, the resonated test pipes or the hfc's? thanks alot man.

Originally Posted by bmarcinczyk14 (Post 135432)

are the stock cats really considered high flow? if so, are they as high flow as the fast intentions cats?

Originally Posted by bmarcinczyk14 (Post 135461)

if i were to buy the FI carbon fiber catback exhaust system with the FI hfc's and stillen headers, would you recommend getting the 18 inch resonators rather than the 12 inch to quite the car down considering the headers will make it louder? will the 18 inch res. keep rasp at a minimum compared to the 12 inch?

Originally Posted by Togo (Post 136395)

Stock Cats are NOT considered high flow. They are nearly the exact opposite. Anyone else's HFC (Stillen, Berk, FI, AAM, Zele, Amuse, etc.) will flow better.



From what has been said by Tony and others, this system doesn't seem real prone to rasp. With HFC and any resonator, 12" or 18", you shouldn't get rasp. It has even been said that the Straight X will not rasp either but we're yet to hear a sound clip.

If you are trying to "quiet the car down" because you are running HFC and a set of headers, yeah 18" might be better. It will just be a deeper sound.

Originally Posted by Togo (Post 136386)

Test Pipes will always be louder than HFCs. HFC have a core, a cat is still there. Test Pipes are just hollow pipes. Nothing to interfere with the flow. Test Pipes will be louder, maybe not by a huge amount, but louder still. They will also net more power, not a LOT more power, maybe just 1-3 or 4 more HP but still more...

Originally Posted by bmarcinczyk14 (Post 136428)

but im not talking about the open test pipe, im talking the resonated test pipe. the resonated test pipe will still be louder than the HFC?

Originally Posted by Togo (Post 136429)

Won't effect your ground clearance because the resonators run parallel to the ground but will just be 6" longer. The resonators are just after the X pipe and before the cans. They are straight through resonators so I don't see how you'd lose any HP.