There are 2 magnaflow cat backs on turbo tech which one do i get if i want the diameter to be 2.5? i have the 2.4 but i dont want to get the one for it and end up with a 2.25 diameter exhaust. so what is the diameter of the one for the 2.2/2.4 and the one for the 2.0 s/c?

 

Best bet is to get the 2.5" and have a local exhaust shop weld it in for you, that way you will get the best flow.

 

The Magnaflow 16619 is the 2.5" for the 2.0/2.4. I just installed mine today actually. The 16618 is the 2.25" for the 2.2L.