I just went to canadian tire, a large automotive store, and they had many different short sections of pipe that changed from one diameter to another, I just found the right one that fit both the collector that came with the D&D pipe and slide over the stock 4into1 collector. I'd like to eventually get a newer 4into1 from kerker or Vance and hines, or something but for now I'm pretty pleased. before my head blew up it sounded great, it has a 2inch straight through mesh core!!. I just lucked out that the elbow tube the pipe I ebayed had two angles, I just chopped the elbow pipe to achieve the seen can angle, The other angle was much shallower, which I'm prolly going to use as a touring angle, so I can throw some saddlebags on, Thanks for the apreciation!!