Mitch Payton’s Pro Circuit Racing
has been around since 1978. In that
36-year time span, the boys at PC
have learned a bit about two-stroke
exhaust systems. The Platinum 2
pipe is constructed from stamped,
18-gauge carbon steel, which is coated using their Electroless nickel-plating process to increase durability. The
pipe has brazed nuts on both of its
mounting brackets. This is a nice feature since it means you don’t have to
remove the OEM slip nuts from your
old exhaust. All of the pipe brackets
lined up perfectly, and it’s compatible
with the stock muffler.
As with all of the aftermarket
exhausts in this test, the Platinum 2
moves the power in the rpm range.
There is a little less grunt on the bottom, with a smooth transition to the
midrange. Once the motor gets into
the midrange, there’s a meaty surge
in power that is a precursor of things
to come. The top-end performance
gains with this exhaust feel huge on
the track. In addition to the power
The Gnarly was designed to withstand off-road abuse, plain and simple. Its thicker steel shell will take a hit
far better than any other two-stroke
pipe on the market. The second
PRO CIRCUIT PLATINUM 2
notable feature of the Gnarly is that
FMF moved the power down lower.
The initial roll-on is super enhanced,
targeting tight and nasty terrain. The
Gnarly is constructed from carbon
steel that’s been nickel-plated using
Tru-Flow stamping. The fit was per-
fect, and new O-rings are included.
The Gnarly is made from very thick
steel and is definitely heavier than any
other pipe in the test.
With this pipe, the power pulses are
completely changed. Cruising along at
idle in first or second gear and snapping the throttle open will result in an
instant rush of forward momentum.
The bottom-to-mid torque increase
is dramatic. As expected, the top
end signs off pretty early. For brutal
technical riding, the Gnarly is our pipe
of choice. Surprisingly, this pipe also
worked well on motocross tracks
with jumps right out of tight turns. It
allowed the rider to carry a taller gear
through a corner then, with a quick
stab at the clutch, launch over jumps.
They say that the torque of a four-stroke makes you lazy when riding
motos. Putting a Gnarly on your two-stroke can have the same effect.
gains, there’s more over-rev available,
allowing you to pull a gear longer
before shifting. This pipe requires the
rider to keep the rpm up, as it won’t
pull with authority down low. The pipe
really rewards the rider who keeps
things spinning in the mid-to-upper
rpm range. The Platinum 2 is a great
choice for fast motos and high-speed