What does a gutted cat look like? and will it pass emmissions? I sold my cousin my stock '00Si exhaust and now my cousin is trying to pass emmissions and he said i had a gutted cat? that it wont pass emmissions without it? Does anyone have any info on this or know what it looks like, what a gutted cat actually does, and will it pass emmissions like that? Thats how i bought it from the dealer and i always passed emmissions just fine until now. Thanks in advance!