I have this comptech exhaust that has a 4" tip. I know the newer ones have a 3.5" tip and had 2.25" piping. But i can't find anywhere that says the size of the piping on my comptech exhaust. Here is the one i have:



I need a new resonator and need to know what size inlet/outlet to get.

 

get under the car, get some calipers and measure it?

 

I never did that because i don't have calipers and i figured someone on here would know the answer easy enough.