I have a cat converter that has failed, setting SES light and a cat efficiency code. The Jeep is out of the 8/80 emission coverage, so it looks like I'm footing the bill for this one. I can get the factory y-pipe for 717.00 bucks through the dealer, or an aftermarket OEM style replacement from 500-600 bucks depending on which brand I go with. I also found Magnaflow has y-pipe set-up with cats, which I've found online from 604.00 to 800.00 depending on the site. Magnaflow also has just the cats, that would need to be welded into the existing y-pipe for about 120.00 apiece. Anyone had any experience with anything other than the factory OE cat/y-pipe set-up? Thanks.