What kind of difference in overall power and speed will i get with a white bros or fmf exhaust,kn air filter and jet kit?

 

on my ex i have a white bros. pro meg silencer and headpipe, k&n air filter, its rejetted, and has some holes in the airbox lid, with this my quad runs much better, it pulls considerably harder throughout the powerband and top end increased a little bit I think, with my friend behind me the other day he said i was doing about 60-62 as long as his speedo is right. I raced a 99 warrior, stock, and i beat his *** all around accelleration and top end. Anyway i think the mods were well worth it, very well worth it