i have the mac h-pipe w/black coating on it. it's on my 97gt conv. i had the mac off-road pipe on it before and i took that off (emissions test). I reset my computer and did a Drive Cycle to make sure all my computer functions were working. There site is at www.obdii.com/drivecycleford.html. I just followed it and nothings come up. I put my steeda mil's on just for sakes. i just look on my superchips programmer to see what comes up. I've passed with it on. i'm not sure how extensive it was because here in pa we have different emissions laws.
I paid 350 i think for mine that's with shipping, got mine of ebay like 6 months ago. probably could get pretty cheap now.