header pipe or not

[scottymx9]

hay guys here is the deal, i have been racing mx for about 3 years i always ran a slip on, i have noticed it always revs quick and has great bottom end thats what i want on a mx track. very seldom lose a hole shot. now i baught a sparks full system and i tried a hmf full system. i lost bottom end, noticed alot coming out of a tight turn, now losing more holeshots, tried jetting both full systems, still not satisfied. anybody else have this problem,can anybody tell how to get more bottom end out of full systems. thanks.

[yamaherman1]

dude u shouldnt hav gotten a sparks for mx, get a tc shorty or n motion.

[blingyfz]

I have a sparks pipe, and the cam mod done, and my bike pulls harder then my buddy's bike with a tc pipe. U need to do the cam mod if u didn't do it.

[scottymx9]

i already have the cam mod done im using the sparks jetting specs.175 main 45 pilot air/fuel 2-2.5 turns out i have k&n filter no lid. now dont get me wrong it runs pretty good, but it feels a little sluggish right off the bottom, coming out of a tight turn. thanks.