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FS Helix high flow cat
Well, the sound increased. It is not raspy or anything it is just louder, and I would like to think that the snail is spooling about 100-200 RPM quicker. I was told by a few other people that there is about a 10whp difference between a cat and straight pipe. They, Shiv from Vishnu and Andrew from Dyno4mance, said it didn't matter whether or not the cat was high flow or not.