I am looking to purchase a White Brothers exhaust system for my Honda 400ex. I have narrowed my choice down to two...the e-series or the e2 series. Is there any real distinct advantage of paying a $100 more for the E2 series? Does anyone have either of the systems on your 400EX, and how do you like it?

 

im not sure if there is a real big difference. i do know however the e series sounds really mean and it helped my buddy's 400 alot with proper jetting. we didfind that with the dynojet jet kit, we had to go one size smaller on the main jet to keep the atv from running a little rich at mid to top end power

 

The e series is better as you can tune it to some degree with the disc. Then buy good jets from someplace like jetsrus.com or equivalent. JMO