Discussion Starter · #1 ·
So I got tsp long tubes and high flow cats. The cats they give are junk so I'm getting cat below threshold on both banks. I did the spark plug non fouler trick but now I'm getting both downstream sensor high voltage. Used 2 foulers per sensor with one drilled out and the second one normal. I know some cars are weird and gotta do different stuff for it to work. Do I need to put steel wool in or drill the second one out bigger?