I installed the Stealth/Bully package to my 2008 C109R. Be sure to follow the instruction step by step...little bit of an IQ test if you don't. The kit is high quality, and the Plug and Play feature is clean and simple. I'm running a stock drilled exhaust, so I'm not getting the full benefit of the system yet (also running the GMAN TRE). Checking into which exhaust to go with. I understand GMAN is working on one to match with this system. I think I'll hold off buying anything until I see what his system is all about.
This kit made a huge difference in the performance of my C109. It runs smoother, pulls A LOT harder in every gear , and it seems to be overall much happier in every riding situation. It's the strangest thing,
the stock set-up just never really felt right. The engine never seemed to be in sync with the gearing or RPM. The engine ran rough at times when changing gears, surging was a problem too. It often felt like it wasn't getting enough air...I've come to learn it wasn't.
The Stealth/Bully system seems to have given the engine the right amount of air, and as a result it runs and performs like a different engine (and bike). The price for the system seemed high at first, but after installing it and seeing how well made it is, AND how it changed the overall personality of the engine and riding experience, I now believe it was money well spent.
I highly recommend this mod for any C109 owner that wants to WAKE-UP their beast. This kit is legit, and the coolest thing about it is...the bike looks totally stock. When that Harley rider, who put major bucks in his Harley, pulls up next to me at the light and thinks I'm running stock...until the light turns green and I disappear in front of him .
Ride safe and remember....four wheels moves the body, and two wheels moves he soul. Fifty8 out!