i just bought a set of 2.5 inch SLP high performance cats, they're so small, i've never seen a cat smaller. i plan on installing a set of long tubes, and these cats. Will i cause a engine code? these cats were originally designed for SLP's mustang high flow emissions legal x pipes. but they're slip fit 2.5 inch. anyone think i'll pass the sniffer here in a few year's when it's time?

 

i don't know if they will pass the visual.... Also how much are the slp cats supposed to flow, i might be interested in getting some if they have a good flow rating

 

there are a lot of fbods running them with no probs now. i dont see why they will throw a code as long as the 02's are in there.