I put one in my 11 over the winter. Paid $2563 for the kit. Then another $100+ for a bigger air cleaner kit.
Runs like a tomcat with his balls on fire. But also started hard and pinged a lot.
Pulled the SE cams and installed S&S 585 EZ starts and a gear drive. Cured the hard start and made it ping less. But still need to run some booster in the fuel when temps are above 80.
I also did a set of S&S wheels and a Timken conversion along with an S&S cam plate and three stage pump. You can run what ever pump and plate floats your boat. But oem wheels and rods is going to be asking for trouble, IMHO.
With the SE cams it had more low end power. Would lift the front wheel at part throttle. The S&S cams are timed later so it is more mid to top end now.
I run a Tmax on it and its mapped to keep the fuel targeted at 13.9-14:1 below 1/3 throttle. Was looking to get 40mpg cruising, which it does. What I didn't plan on was it running 85+ at less than 1/4 throttle. Made a run on I81 last month, me and some rider on a King. We ran almost an hour and a half at over 80, and often 90 mph. Still got 200 miles on that tank, but the pipes were scary looking when I got home. Thing is it was only taking about a 1/4 twist to run that speed. When I looked at the maps, it was showing that the scooter was running with in 5% of the mapped targets.
Left pipe wasn't all that bad
Right pipe was real white
The right pipe has a full size cross over that uses a split spacer to make it fit the head pipe. And the split is open about a 1/4 inch. Guess I need to pull it apart and seal it up.