Doc, yes, They have a "Full size round under chassis crossover pipe". Jackpot Full size X-over kit (FM-14-X0) 119.00. You can see a good picture on their site, just search X-over. I don't know the diameter of the pipe but I removed the under chassis squish pipe from H/D and replaced it with the full round X-over ( seems like they would call it the X-under). Also to keep things straight, I bought my X pipe from Steve in June 2011, at that time I had no idea that the H/D pipe was squished until installation of the new pipe. I called Steve back then and ASKED if there was a replacement for the squish or could he make me one. Alice got back to me and told me that they had tried that and there was absolutely NO Dyno increase or advantage in HP or TQ by doing that. Well two years later Hmmm.. Maybe its just his pipe that works and the round under replacement doesn't?? When I make my next change with heads and pistons I'll run a base but I'm not going to spend 300.00 to Dyno just for that under pipe and see if it did or didn't do anything. Thanks