The pipe size is 1 1/2". I had bought some replacement pipes in the past and until you install them you don't know what they sound like? The ones I got are crazy loud. I wouldn't ride without ear plugs. I guess i am looking for something a little easier on the ears. Bill stated that the Roadhawks from CRC are quieter then the Dunstall Replicas, so they may be my choice.
Thanks, Matt