The DR.D bike wasn’t littered with hop-ups. Instead the focus
was on the exhaust and clutch, both of which are winners.
Believe it or not, the DR.D KX450F wrap-around exhaust is 30mm longer than a standard pipe, yet the muffler is six inches
shorter. It took three months for Dubach to develop the system. It improves mass centralization while boosting power.
Doug Dubach understands the effectiveness of stock
parts. As Yamaha’s endurance test rider for decades, he
knows what works and what areas can be improved.
Launching Dubach Racing and Development (DR.D) was
a natural progression for Doug, because he could take his
testing expertise and make products that benefited the
average consumer. Dubach’s ingenuity spawned the
radiator-lowering kit and engine relocation kit designed
specifically for Yamaha’s four-stroke line. These products
have been tested by MXA in the past and garnered
five-star reviews. And, some of their genius was put into
the 2015 Yamaha YZ450F.
However, Doug isn’t a one-brand pony. To prove that
he can fix more than just blue bikes, he created a unique
wraparound exhaust system for the 2015 Kawasaki
KX450F. The head pipe routes in front of the frame,
wraps around the left side of the engine and weaves
between the back of the engine and the shock. The
muffler mounts to the same bracket as the stock exhaust,
only it is considerably shorter. His design shows
that Doug graduated from Yamaha’s school of mass
centralization. The mass of the DR.D exhaust is closer
to the engine, despite being 30mm longer than the
MXA’s DR.D Kawasaki KX450F bike was never
envisioned as a money pit. We did add a few other
hop-up parts to accentuate the benefits of each product
without watering down overall performance with a
myriad of unnecessary items. We focused on the Rekluse