tell me all about them,what kind do you have and how did they clear the exaust? I have hotchkis SFCs,but I can't install them yet because the y-pipe from my headmen headers gets in the way,I also have a cat down there too. I'd like to keep the cat if I can. I would prefer to keep the Hotchkis SFCs and ditch my exaust setup,but I heard there are I-beam type SFCs that will clear the y-pipes on thirdgens. thanks