Unfortunately, i was never able to hear the stock sound of my bike because this exhaust came on the bike when i got it. Its definitely one of the best sounding motorcycles in my area. Very loud with a great sound. (2006 ZX6R)
I didn't want to spend a fortune on an aftermarket slip-on for my 2008 Kawasaki ZX10R, so I chose Hotbodies. Installation was easy, however the manifold clamps that came with the exhaust did not fit, so I had to re-use the stock clamps. I didn't notice any power gains like Hotbodies stated, but the MGP Growler looks and sounds a lot better than the stock exhaust. I would definitely recommend this exhaust to anyone who doesn't want to spend an arm and a leg.
I just installed this a couple weeks ago on my 2006 r6 and it definitely made a difference sound wise. Now a just need mjs headers, a mid pipe, and a power commander. Can't wait...Definitely recommended if youre looking for nice gp exhaust for a good price.