First I would like to start off by saying I have been searching all over the place for a good exhaust option. I contacted K-Speed and was told it would cost 150 dollars just for shipping. Therefore, I decided against this option because of this and the whole 10-20 delivery time. I then started watching videos of the TBR slip vs the Coffman. Initially I figured for 200 bucks what could go wrong but ultimately I went with the TBR Slip-on. I must say not a single video does this thing any justice. The sounds is absolutely phenomenal and I too am noticing my shifting about 5-10 mph quicker than with stock and the bike is riding flawlessly. The slip-on gives it a mean sound with a very low grumble and even when you let off the throttle it will even pop and bubble a little bit. I can post a video if anyone would like but I promise you it won't do any justice. Lastly, I was on the fence about spending nearly 500 dollars just for a slip-on but if anyone is familiar with 58cycle out of Virginia they are currently selling the slip-on for 399 free shipping. I placed the order Sunday night and received it today, I live in Georgia. The look is amazing as well with the carbon fiber.