I don't remember if this has been covered already so I will just ask it. If I run a straight pipe in place of the cat with this y-pipe, what do I have to do to keep the O2 sensor happy and the check engine light off? If anyone could help me out that would be great.

Thanks

06 Mustang GT - stock 96 SE V6 5spd Midnight Red - 15.9 @ 86.8 150K miles Mods: Bilstein struts, H&R springs, Borla Cat-Back, Brullen y-pipe, Gutted Precats, SVT UIM+LIM+TB, K&N FIPK, , DMD, Magnecor KV85