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i have a 99 civic si with a drag gen III turbo and apexi N1 exhaust w/stock cat...i want to take out my cat and put in a test pipe or straight pipe...the places i have aksed wont do it cause its illegal....how hard is it to do? does it just bolt right in or would i need to weld it?
not hard to take off a cat. all it is is a 3-bolt flange and a 2-bolt flange going to the downpipe. as TEG said you can just get a highflow cat and stay legal, or if you really want to have those extra 4 or 5 horsepower you can just use a test pipe or just get another cat and gut it.