Empire Industries designed this full-exhaust system from the header pipe to the
muffler. Their system gave the 450R major power gains through the whole range.
After a proper tuning of the fuel-injection mapping by the Power Commander V we
installed, the YFZ was a rocket ship. We didn’t need to install any expensive internal
engine parts to gain more horsepower.
Empire Industries, YFZ450R exhaust: $559 .. (951) 734-7433www.empireindustriesinc.com
Pro-Tec, Vented airbox lid: $85.95.................. (951) 698-8988 ................. www.pro-tec.us.com
Dyno Jet, Power Commander V: $379.95................................. www.powercommander.com
the power of the quad in stock form
but wasn’t expecting what was in
store for his next moto.
We then installed the Empire
exhaust, Pro-Tec airbox lid and
adjusted the fuel-injection mapping.
Our test rider took to the track for
another six-lap moto, where the
changes to the YFZ were noticed
immediately. Lap times dropped, and
in sections where the Yamaha struggled to clear jumps or power through
turns in stock form, it tore through
the track with ease. The low range
had a mean grunt of torque, pulled
hard through the midrange, but,
most noticeably, boosted far harder
through the top of the power range
with the new modifications.
To our test rider’s surprise, no
engine internals had been touched.
The YFZ had major power gains
from a great aftermarket exhaust system from Empire Industries, a high-flow Pro-Tec vented airbox lid and
a change in the fuel-injection mapping. You don’t need to break the
bank to gain more horsepower from
your ATV. The right knowledge is
key to pulling the ponies out of your
HOP-UP TIPS HOP-UP TIPS