I need to know quickly which exhaust is better on the 400 EX. Either a White Bros. E-Series full system or the White Bros R-4 full system. I am planning on purchasing one within a couple of hours. Thank you. Your thoughts are appreciated greatly.

 

both are about equivalent power wise. the e series you can adjust with discs and the r series you can't. just make sure you get the pro-meg headers no matter which silencer you get.

 

r4 is a really sick setup... a lot of gains in midrange but im not sure if they make the silencer anymore?

 

Thanks guys. Actually theyDON'T make it anymore, but I found a place on e-bay that purchased a bunch of the last ones.