Looks good but rediculous expensive for what it is. I bought a $0.99 piece of 1.5" exhaust from a parts store (go to an exhaust shop & I bet its free). Cut it at an angle, welded to stock 300 endcap (after drilling out the hole to 1.5") & done.

 

My dad is going to do up my exhaust and re tune the bike for me when winter comes in, cause riding in the snow is better than playing with a.....

 

I replied to this post before, but somehow it disappeared. The easiest way to gut the stock exhaust is to take a 12" long 1/2" drill bit and drill through the 2 baffles. Slight sound and perfromance gains, maybe 1/3 to 1/2 (stretching it) of what I gained vs. HMF slip-on. The KLX 300 muff is a good choice too, I picked one up but never used it as I have looked high and low for the head pipe and never found one.