I put a Bisson Pitts on my DA-50R. Easy installation and it sounds great. I put it in a Wild Hare Extra 300 and it fits well under the cowl. The only mod I did was to cut the pipes so I could get the cowl on. I did this very carefully so as not to cut off any more than was necessary. After cutting, the pipes extended about 1" below the cowl and this was fine and I didn't need any extensions.