the catback is 2.25"
Ya, I was pretty sure it was, I've just seen some conflicting info about the MP3 catback. I may take mine off this weekend and measure... If it's not 2.25" I'm upgrading, lol.
For exhaust diameter measurements, you measure the inner diameter right? So the MSP catback has an inner diameter of 2.25"? Just want to make sure... (doh)