You may also want to look at fuel moto's options. They have a fantastic reputation, and stand behind their products.

 

There are couple of stage 4 kits. One stays at 103 and will produce around 110 hp and 115 torque. The other carry's it to 110 Tire shredder and will give about 7 to 8 more hp and torque than the 103 stage 4 all depending on exhaust system and tune. You may also have to put stronger springs on your clutch with either kit. I think the 16 limited has the A&S clutch which may stand up to extra torque without slipping. They will definitely be louder and a bunch more power and when riding at a cruising speed will get as good if not better mileage. twist that throttle and mileage not real good on stock or Stage 1 or stage 4. Do some research as there is lots of info on them.

 

 

 

In my opinion you would need a stage 4 103 to out perform the 107 M8. A stage 3 would definitely keep up with one if tuned right. If the 107 gets stage 2 you would be out of luck with the Stage 3. Keep in mind the weight makes lot of difference. Around 10 hp needed for every 100#'s additional weight. With that few miles you could just do the CNC heads and a drop in cam like the SE 585 or SE259, or Feuling 543, 574 or Andrews 57 or Woods 222, or Woods 555. Lot more cam choices.

 

I have the 103 Stage IV kit, high flow air cleaner assembly, Screamin Eagle High Flow exhaust system (decatted), and the SEPST on my 2015 Ultra Limited. Bike runs really good and has a very big usable powerband. Exhaust tone is very deep and not raspy at all. The 110 tire Shredder gives you 7 more cubic inches and the SE585 cam instead of the SE259 cam.

 

am i reading this right? Stage 4 twin cam to keep up with a stock 107?

 

if it's on the internet it's gotta be true right? Lol