"So maybe Two Brothers Racing isn't quite the household name that some of
the other brands in this comparison are. That doesn't mean that it can't
take its decades of experience in AMA road racing - and more recently
its affiliation with guys like former AMA motocrosser Joel Albrecht and
AMA supermoto racer Steve Drew - and build a gnarly pipe. In fact, by
looks alone, the M-7 might be judged a winner.
The M-7 is a
beautiful three-piece system that features a lot of bling in the form of
a snazzy carbon weave in the muffler and gold anodized header flange
endcap brackets, sound suppressor and muffler mount. One thing that sets
it apart form the other three-piece units is that the muffler bolts to
the midpipe rather than being attached by springs. Overall, the system
looks too pretty to be dragged through the dirt. It weighs in at 5 lbs.,
17 oz (sic). Mounting was a little finicky.
The M-7 was right in the thick of the chase on the dyno, recording
peak horsepower of 47.56 hp at 8700 rpm, and peak torque of 32.11
ft./lbs. at 7100 rpm. Even better, when we threw in Two Brothers
Racing's P1 Power Tip, the M-7 picked up both horsepower and torque,
checking in at 47.9 hp at 8700 rpm and 32.14 ft./lbs. of torque at 6900
On the track, Bard pointed out that the throttle response is very
snappy with the M-7, but that it feels more like the stock RM-Z system
at low revs. He also said that while the systems features a strong
midrange grunt, it tends to feel a little flat up high.
n open mode, the M-7 matched the noise output of the Big Gun EVO R
during out sound test, clocking in at 101.2 dB, but adding the P1 Power
Tip dropped it all the way down to 96.8 dB. Keep the suppressor in place
and you could just about ride your M-7 equipped moto machine all the way
to sportbike night."
Excerpted from MXi Motocross Illustrated magazine.
Vol. 2 Issue 3 p.