Graves Motorsports Yamaha YZ450F WORKS Stainless Steel Exhaust System with Carbon Silencers. This exhaust features Graves Motorsports proprietary ADSD exhaust technology.Up to a 20% gain in horsepower is achieved while eliminating weight. This system Yamaha YZ450F exhaust features all stainless steel construction with a carbon fiber silencer. 98dB @ 4000 RPM.
The ADSD™ is a targeted approach to the perpetual compromise between horsepower and sound level while at the same time improving torque, fuel efficiency and throttle response. And unlike currently available exhausts, the ADSD™ system accomplishes all these benefits simultaneously, throughout the entire usable RPM range.
Graves began development on the ADSD™ system due to increasingly strict sound regulations for competition world-wide. The goal was to exceed the exceptional level of quality and performance of previous generations of Graves Motorsports exhaust systems while complying with all regulatory bodies in regards to decibel levels.
Graves is proud to announce that those goals have been met and surpassed. The average ADSD™ sound reduction over a conventional-style exhaust is 2.5db, while maintaining horsepower increases of 12-20%. The secret is in the two-chambered header pipe, specifically tuned to divert returning exhaust pulses, avoiding power-robbing turbulence near the exhaust port and reducing sonic amplification. No other system can give you the same performance and meet these goals.
Graves Motorsports has kept this technology solely for the use of their championship winning race-team while traversing an in-depth patent application process, but is now able to offer this exciting product to the general public. Graves brings you the first of many new systems utilizing this technology.
This system has been extensively tested by the Graves Factory Supermoto Team and was used by Brandon Currie to sweep the 2008 AMA Supermoto Lites Championship and on Mark Burkhart’s 2008 Moto X Games race winning machine.
Author: Kyle Guglielmetti
After wokring with the Graves Supermoto team bikes for 4 years, I can tell you that this pipe was one of the single most important changes that were made. While reducing sound due to increasingly strict sound regulations from the AMA, this pipe still increases power across the rpm range. One of the key parts to the ADSD system is the improved rider usabilty, it makes the available power more usable to the rider especially while modulating the throttle mid corner or in teh dirt sections.
