richelesro
Member
- :
- 2003.5 BYM MSP
Okay. The stock pipes are 2.25". The flanges at the stock cat pipe and exhaust are 2.25". Now, if you purchase an exhaust that bolts directly to the stock pipe, it's going to be 2.25". If you purchase a 3" exhaust (which is probably what other places are selling), you have to also purchase a 3" downpipe to attach it to.