the grp pipe is the same as the dynamite 053 so thats odd right there. i had great success with my grp with the grp pipe. it is a little low on torque compared to a v spec and orion motors, even the nova motors. but thats what gives the great fuel mileage. i ran the stock clutch setup on my 8ight and it worked great. with it in my mugen i ran 1.0 springs with the lightweight shoes and 13t bell and it was really good. and i was running mine with a number 5 grp plug and 8mm restrictor. you could use a #4 plug, a little hotter, but make sure you have the 8mm restrictor.