Hi there, here's my 2 cents worth. I have on 08 R3T and I have
D&D's on my bike. They seem to work pretty well. Fit and finish
was very nice. My only complaint is that they have a bevel cut
with the long edge at the bottom. It makes contact with the ground
too easily when I'm cornering or leaving a driveway with a steep curb.
The sound is about as much as I would want to go on long tours with.
They can be had for about $635 a set (EBAY). Power increase is probably
very minor (my guess is about 3-4 HP and probably the same for torque).
The other gain is the 15+ pounds lighter that they are over stock. I can't
comment on Staintune other than that they are really big bucks. Good luck.