Ok Gents so here is what I've got so far. I bought the new 12 WR450F two weeks ago Picked it up on May 18. Went for a brief break in ride about 28km/17.5 miles next day. Left it straight out of box for first ride. I am 6'4 250lbs. Suspension was really well set up right from stock. Noticed only had 1/2 throttle available, good power but choked up. Bike felt great - coming from older WR250 2 stroke I was very impressed. Following week ordered and installed Acerbis hand gaurds with the aluminum inserts. Went out on 3 rides after with bike still stock on 26th & 27th. Put on about another 100km/60 miles of really good hard riding. Still was dissappointed in bike being choked up. Pulled airbox plug out yesterday, removed throttle stop, took out for a short rip, 110% improvement, I've order the comp ECU and Throttle stop, hoping to get it late this week. Still planning to change muffler as well So far i'm really impressed bike handles well, weight feels very well distributed, suspension gives very good feel, power is strong.