Hi Bill,
My previous bike was also a TDM 850. The MTS is more powerful than the TDM and has far more caracter. As you can read on this forum the MTS is a bike that provides everything from a lot of problems too a lot of fun, horsepower and attention from others.
My MTS has shown no problems at all ...

My dealer says that removal of the katalysator only gives the bike approx. 2 hp's more.
My weight is just about 67 kg so relatively I have more hp's on my rearwheel than someone who's weight is much more than mine.
So I dont do anything on the engine performance (just termi's but thats just "fun ...