Originally Posted by Fan4Focus
It is 2.25" and I believe they have a 2.5" option as well.
Hmm well then that's not bad though I recommend a 2.5" exhaust. I have a magnaflow exhaust and it's supposed to be 2.25 but it's a tad under that. I suspect that all 2.25" exhausts and parts that size a shade under that measurement. I bought a Thrush glass pack to put in to quiet it down and it's was the same diameter, I ended up putting a 2.5" one in since it wouldn't restrict it any and still take the noise out. Worked out perfectly and is so much more tolerable now.