A few months ago I brought a brand new 2009 R1 raven. The OEM pipes on the ride home was embarrassing. I knew these pipes would make difference but I wasn't sure how much. What I got was a growl that would make a Harley ashamed and the installation was quick and easy. Drivers take note when I rev my engine behind them. I see people checking their rear view (and side) mirrors and babies wake up out of their sleep in the back seat. I even had a buddy tell me he heard me changing gears clear after I left his home. If you are looking for a kick, a growl, and an attention grabber...you cant go wrong with these puppies.