shook
01-02-2002, 08:05 PM
I have 400ex it has JE piston and xr400 cam some minor head porting.I was wondering if the header pipe would help by the way the piston is the 10.5:1 any way if so what would be good one to buy.Ive seen the xr only ones and have heard of the fmf power bomb I think thats what its called any suggestion or experiences would helpful.