Stage 5-AT, and I don't even know where to start. The bike is so much better, I can actually ride below 4k RPM. It definietly has more power, and feels better at any RPM. I used to only go to 6th gear at 70mph+, now I can ride at 55-60 in 6th without lugging the engine. The install was a bit of a pain, I had to piece together the instructions from multiple videos/PDFs to make it work exactly as I wanted on my bike. Hooked up the AT to ACC2 under the seat, and it works flawlessly. Only have about 80 miles on it so far, but what a difference. Would recommend this mod on any KTM bike, it smooths out the throttle, the engine braking is more manageable and smoother, and the noise is just beautiful. Overall the bike is just better, I also added some extras like the stage 2 SAS/canister removal, O2 plugs, 2nd velocity stack, crankcase breather kit, Austin Racing GP1R, overall very satisfied with Rottweiler, and the products they offer.