Cant answer that, the bike came with the fmf pipe and i did the other mods pretty much at the same time. The 15 tooth cs seemed to be a real improvement, the taller gears and pep are good, just dont like my 11 yr old being able to go 60 mph!!
04 crf 80 with snorkle removed, air box drilled, fmf exhaust, 15 tooth sprocket, and size 100 main with needle washer lowered. I am wondering how much low to mid i would gain with a cam or about any other mods beside over boring??