Since purchase a few years ago I strongly dislike two things about this bike, the seat and exaust (and thats really it, perhaps I'll write a long term review for the bike itself one of these days). Anyways, 2 of 2 issues are now remedied and I am all smiles. Initially I had ordered an Arrow Pro Race after seeing BMW was outfitting their F900R British cup bikes with them. But due to repeat let downs from Revzilla regarding missed projected shipping dates, delays with no clear eta, I changed my order. After a few persuasive emails to revzilla I ended up receiving a decent discount... so I picked up the Akrapovic instead. It is louder than stock, thats for sure, but not obnoxiously so and the tone is great.