white brothers e-series-s-bend pipe

I have a 250ex and I realy like it . I just ordered the w-b e-series s-bend pipe for it . How much more bottom end and mid range should I get from this pipe do I need to rejet.

[400exredrider]

ive heard you dont hafta rejet if you dont have anything else done to it so dont worry bout rejetting as far as power and torque The WB is fully adjustable heres how it goes the more plates you have in it the more topend power the less plates you have in it the more bottom end power you will get........GOOD LUCK AND WELCOME TO EX RIDERS P.S. THE WB WAS A GREAT CHOICE!!!!!!!!!!!!!!!!!! I JUST PURCHASED ONE TOO AND IVE HEARD THERE GREAT