Hello all. As the title suggests I am the proud owner of an 08 sm450r. I have put about 600 miles on it, and have loved every minute. So here are my questions. 1st question...How much louder is the Arrow exhaust (that the dealer is selling as part of the power-up for $399 installed and remapped via iBeat) than the stock exhaust? I pulled the spark arrester out of the stock can to see what the bike would sound like with a little more free flowing exhaust, and by my ear-o-meter I am guessing 2-10dB louder. I don't want a loud bike, because I don't need to draw any more unwanted attention to myself (the bike does enough of that sitting still). 2nd question...with the powerup, I know they do the Lambda blockoff, and remap the FI, and early searchs seam to show a 20% power increase and seems to fix the stalling at idle issues (mine does this occasionally). Can that be true? What does it do to the fuel economy? I am averaging almost 50mpg now. I wouldn't care if I were racing it, but I don't want a 30mpg commuter. Can I do the power up and leave the O2 plugged in? Will I need a special mapping, or a power commander? I love my bike now. I don't want the cops giving me grief for noise and my wife asking why I needed to spend $400 for less mpg , but I as a man, I can't leave it alone for much longer (I have already pulled the carbon can and associtated plumbing off as it was blocking my view of the motor).