Guys, I may have made a mistake buying a Q4 for my 450. I was going to use it with my Megabomb header BUT after trying to separate the header/midpipe on Megabomb, it won't budge! I'm not going to separate it because it's only for one week that I need to keep my bike quieter, as I'm going back to Megabomb header/4.1 muffler after week is over. That said, I'm just going to use my stock header, either with Q4 that just bought, OR with stock muffler (which I've heard is quiet, but I have never ridden with it) I assume the stock muffler is fairly quiet, but would it run as good (or nearly as good) as with Q4? Thx!