Ok here is the situation. i but a 3' downpipe, 3' highflow cat, and 3' magnaflow muffler on my car, naturally 3' pipe. the exhuast shop put the o2 as close to the same spot as possible. after the install everything was fine, but at about 140 miles later my CEL came on. but the weird thing is, about 50 to 60 miles later it went back off.

my question is has anybody had the same thing happen to them, and will the light come on and go off, like a warning, because it has been off for 60 miles??????????

one last note, to anyone thinking about magnaflow mufflers, i say go for it, mine sounds great. i have so many people telling me it is the best sounding four cylinder ever. i had one guy argue with me about with it was a 6 or 4 cylinder!!!!!

 

You drove 60 miles with your CEL on ?

 

I have had the same problem with my car. the afr is very rich now.