LAG
The M7 stock will still out run a M8 top end. The bottom end of an m8 is definetly snappier. This year i went with the bigger Twisted y-pipe(new from shain this year) and also brought the ports out to M8 specs to get more bottom end. I stuck with the 700 motor to keep the stock 700 timing, because like i said it will out run an M8 hands down top end.
That being said i haven't run it with the new mods yet. But even if i didn't do these mods i would still prefer the M7 over the M8. As for pump gas turbos i think the power doesn't justifiy the $ spent. Go race gas! And if your like me and ride 7,000 ft and up you'll only have to run 50/50 pump to race gas and can still turn up the boost to 13lbs safely! Hope it helps, get TWISTED.