I knew the 8th gen engine has 9 degree's more overlap from the intake cam revision and i speculate the reason for the piston change was probably to deepen the intake valve pocket for clearance around tdc being the cam is advanced 3 degree's vs previous gen's since the piston has long relative dwell time. A longer v-stack set is used for the low-mid range however looking deeper into it, the engine cases, both cylinder heads,crankshaft,flywheel,stator,both transmission main and countershaft's among other internal parts are all new. No more charging system problems most likely but the other changes makes me wonder what could be in store for the future. I would like to know if either the crankshaft or flywheel is lighter than previous generations and if the engine case change is to allow more clearance for possible additional stroke in the future. . The 2016 or 2017 euro version has airbox and muffler change. Myself, i don't think Honda is finished developing this 90 degree V-4. I hope not anyway.