430rico
09-03-2017, 09:03 AM
So before everyone just tells me to use the search button, let me explain my situation. I am putting a 4.2 ART in a B5 chassis. The yard I got my donor car from cut the cats out of the down pipes, so I am now left with several options for an exhaust solution. I wanted to do the right thing and install new cats, but I can't bring myself to spend a lot of extra money on something that will lower performance on the car. So the plan I have settled on is to Y the semi-downpipes I have left together and do a custom single 3" back to save cost/weight. This gives me a dilemma with o2 sensors though. Does anyone have a suggestion for the rear o2 sensors (besides an expensive tune to code them out) that will help with engine performance. I have read that leaving them out of the system or using spacers can cause fueling issues that lead to poor performance/efficiency.