I have a choice between the white bros. r4 and white bros. e series ive heard both and think they sound nice but which adds the most power?

 

The e-series is adjustable by adding/subtracting discs while the r4 is not. It probably depends on how much you want to mess with it but I believe most reviews I have read lean toward the e-series. I have an e-series pro-meg on my warrior ... it came stock with 12 discs (thats the way I left it) but can have up to 24 added to increase air flow and decibal level most likely.... it will be LOUD when you rev it but its not much louder than stock while idling. My neighborhood has already been broke in by the guys down the street with Harleys so I don't get too many scowls =)