Dont know the sizing on the muffler or its piping but the kid i bought it from had stock piping I think, I just saw a video on honda-tech where the kid had the same thing I did, with the 2.25 piping, but had a resonator and it sounded nice. I have the video and I'm going to take pics of the muffler piping also when I get home... So be on the lookout I'll upload when I get home and take some pics of the piping hopefully. Thanks for all the help so far.