A42.0rgy

I am probly going to go ahead and do a 3 inch exhaust since my car is on the lift right now anyways. My question is who makes the best high flow cat? Also, does anyone know if anyone makes a full 3 inch exhaust. I am looking to buy a 100 cell cat, 2.75 or 3inch dp, and 3inch ehxaust. If anyone knows where I could piece this together from it would be great. Also I dont want to get any CEL with the new exhaust.

Thanks!