Just got back from the VTwin Expo in Cincinnati. From what i am seeing there will be a lot of engine upgrades coming from the after market world by spring. Wiesco has developed a bolt on 117 and a 124 big bore kit for the M8 engine.Bob woods has his 222 cam ready for the M8 also.
Woods along with Fuel Motto started with a stock 2017 Street Glide,added Fuel Motto's head pipe,mufflers and stage 1 air cleaner and Woods 222 cam.Then using a power vision tuner tuned it on the dyno,with a end result of 112 hp and 115 ft lbs torque.Now according to Bob Woods there was no disassembly of the top end. Every cam and head builder is saying that the 4 valve heads out flow the 2 valve heads in stock form by a large margin.
So those of us with the new M8 and those thinking about one will have some very good bolts in the up coming year.