Alright so I bought the WB Aluminum Pro and I honestly dont like it. It woke the bike up a little....but my lap times went down. This pipe rubbed my powerband in all the wrong places. And It came with that low header so I couldnt touch my oil filter. Honestly I like my stock pipe a little better because it is easier to ride with.... O and most of all....I know how to jet a 4 stroke, and this pi pe wouldnt run for crap on my bike. Backfire pop backfire.... I honestly want to sell this pipe .....get a DR.D. Or a pipe that is cool that ALLOWS you to get to the oil filter..... so what you think I should strive to get the DR.D?