ok so i have megan racing headers / megan s-pipe with 2 defoulers / stock mid pipe and i drove like 200+ miles for the past week and no CEL came up. but when i went to a exhaust shop to get them to cut my stock mid pipe both the round things on the stock mid pipe the big round one (resonator) and the small round one which is the cat? and i added my 27 in magnaflow resonator.. but after like 30 miles today my CEL came up... anyone know whats up?

is it because i have no CAT any more? since i removed the header cat and the mid pipe cat? or is it cause of the s-pipe with only 2 defoulers? should i put a 3rd defouler in?

 

Search "antifoul"

 

get a scangauge it'll be one of the best things you'll get.

 

You have short antifoulers and long antifoulers can't remeber the part numbers but anyway just buy a set of each then begin the process of playing with different combination until it works right. I had a megan set up on my old tc and I think it use 1 long and 2 short ones. It will take several miles before it will come on if you have the incorrect combination for your tc in your area of the country or elevation.