Quote:
Originally Posted by bmarcinczyk14
are the stock cats really considered high flow? if so, are they as high flow as the fast intentions cats?
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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.
Quote:
Originally Posted by bmarcinczyk14
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?
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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.