I thought so too, the left one just fit like... just perfectly. I don't know what was up with the right one.
I just got back from a ride. That was great! It sounded like a real motorcycle. Had a lot more torque and HP (no dyno). I usually play around 4-4.5k RPM, now I was going to red line for fun. Totally hooligan. Definitely worth it. Everyone who is on the fence about hacking up their air box, or getting a NARK, etc. and free flow exhaust,
DO IT!!! It is amazing what a little free-er breathing can do for this bike.