i have a 400ex and have wanted to put an aftermarket exaust pipe/slip on. i have looked at a few slipons. i want somthing that is pretty loud and can make some nose. the most i want to spend is $300. is the white bros e-series, big gun evo x series.. i also want somthing that has pretty good performence too. what do u guys suggest??

 

I think that both pipes that you named are good. the big gun will be louder than the white bro's... It all depends on what kind of riding that you do..

 

We tried a couple and the HMF gave the best horsepower numbers.

 

what kind of HMF is the best??? i know they make many different kinds?? what kind of hmf gave the best horspower