If you have the money this is the sickest looking pipe and is as quiet as they claim to be. The pipe also smoothed out the power on my 2012 kx450f. It also gave it a deep throaty sound. I had absolutely no problem bolting the exhaust onto my bike.
Yoshimura RS-4D Pro Series Titanium Full System Exhaust
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The Yoshimura RS-4D Pro Series Full System Exhaust (Titanium/Carbon Fiber) is a must have. It is light weight and gives you very noticable low/mid range gains in performance. This system is also extremely easy to install. I would recommend this product to any serious rider out there.
Dirt Bike / ATV: 1-888-676-8853
most performance out of the Yoshimura system, fuel injection
mapping is recommended.