This is a 2 1/2'' dia. stainless, the stock oem tips have been cut at the back to accomodate the larger dia. and maintain the stock look.
Although yours does not look anywhere near stock, lol.
http://s203.photobucket.com/albums/aa59/340butterduster/?action=view¤t=P9020046.jpg
thanks - that looks really nice - I like that color too!