Quote Originally Posted by 98GT3800 View Post
I did the DP without the cat. It sounds pretty good (i left the resonater) but i left the u-bend factory. My question is After 3months of running this, the past week my SES (service engine soon) light came on. It is the O2 sensor after the cat. any way around this or should i try cleaning the sensor or getting a o2 eliminator. THANKS

Wait...what?

Why in God's name would you have a shorty DP welded to the u-bend????

that is probably creating MORE KR than before since all that air is trying to get out even faster with the 3" DP and the U-Bend is still there. Do the car a favor and get rid of the damn thing. The whole point of ANY exhaust work is to get rid of the u-bend FIRST!!