Like the title says, how much louder is the bikeman? I think the MBRP is the quieter of the two. I dont want it really loud but I like that 2 stroke brap. Wheres the cheapest to buy one? The HPS is just to much money. Leaning towards the MBRP, has anyone that has one notice a change in driveablity? That orange assault thats on a bunch of youtube videos has the MBRP and sounds nice and not to loud. Input greatly appreciated before purchase.