Hey folks, with MotoGP and a motorcycle rally in town this weekend, I haven't had time to jump on and report about my 900rr exhaust swap. I will start another thread when I get my full video compilation together, but for now here are some thoughts:
Number one, this swap is amazing and badass and I highly recommend anyone with a 919 do it ASAP.
Number two, unless you are an accomplished mechanic/fabricator, this is definitely a two person job. My friend and I took turns holding parts or the bike in place while the other one was twisting the wrench, etc. It was really smooth.
Number three, you will almost definitely need to do a small bit of cutting/welding. We measured and chopped the original bracket on the headers while holding the system in place. Then we bolted the headers on, and the bracket was an inch off. We had to weld a second piece on to bolt to the center stand bracket and hold everything in place.
I am really impressed with the weight distribution/reduction. Even though it is probably less than a 10 lb difference, the tail feels lighter and I can tell the mass is shifted to below the bike. A little goes a long way in this case.
Performance is roughly the same, but above 5,000 revs it does seem to pull a little harder. I will probably take it in to get it remapped, but it doesn't seem to be running lean at this point.
And the sound is amazing, under 4,000rpm it has a nice throaty exhaust note. Not wicked loud, but noticeably louder than the stock pair under the tail. Over 4,000 to 5,000 it sounds like a wild animal. Think of halfway between a Ducati Monster and a CBR 1000. It's awesome. Also, I painted mine gold with high temp from the auto parts store. Looks ridiculous, in the best way, and I love it.
Final thought: Do this swap now. you will not regret it.