Hi all, I am now happy with our finished Sports Muffler for the XTZ 1200. After several proto types I have currently settled on this design. We started off with a 1/12- 1 3/4 link pipes. The bike ran very vwell but was missing something. Yes a really deep note. So we opted to go with a 2" Link pipe. We have also did following mods to bike. and well you guessed it, Super deep sports note that gets people looking to see what is making that V-Twin Type Rumble. Check out OLD DOG & HAYFARMER Reviews. Mods to Bike: K & N Filter : 4HP Increase. Power Commander & Dynojet Tuned with custom mapping. Overal we have gain a 15% Increase from when we started. The bike now feels more responsive & from 6000 rpm pulls hard. I am now looking at doing a full Header replacement (In S/Steel) depending on interest. Thanks for looking.. Chappy.