Originally Posted by Southjersey128
I thought that the magna flow exhaust deleted the secondary cats on the 128 since it connects to the bottom of the exhaust manifold. Assuming you still have the mf cat back exhaust. If you did delete the primary cats you would get a cel.
I am pretty sure it goes to the second cats only. I can double check tomorrow by taking a peep under. But compare the two images.
EDIT: I have my old exhaust in the garage. the secondary cats are definately not there, so they are in the car
to what I have