2004-2006 Yamaha R1 Evolution2 / Evolution / Racing
Slash Cut Full Exhaust Systems by Akrapovic
Supersport motorcycles like the Yamaha R1 call for top-quality aftermarket
components and the Akrapovic EVOLUTION2 / EVOLUTION / RACING systems definitely
rank in that category. Installing one of these systems will make the engine come
alive. Experienced riders and racers will be able to maximize the advantage
offered by the Akrapovic EVOLUTION2 / EVOLUTION / RACING exhaust systems. In
addition to the increased performance, the visual effect is also dramatic, as
the systems fit right in to the sharp lines of the Yamaha.
The Akrapovic EVOLUTION2 / EVOLUTION /
RACING systems for
the Yamaha R1 has a specific configuration of 4-2-1-2, which means: 4x
header tubes run into a double collector, which is attached to a single
Y-connecting tube, from which the dual mufflers are led under the seat. For
the RACING system the header tubes are conical and made of stainless steel,
the collectors are cylindrical and made of stainless steel, the Y-connecting
tube is conical stainless steel, both link pipes are cylindrical titanium
welded to the mufflers. The rest of the connections are sleeve joints held
together with
silicon-shielded tensioning
springs. The mufflers are available with either titanium or carbon-fiber
outer sleeves. Muffler outlet caps are made of carbon-fiber. The tubes for
the EVOLUTION system are all made entirely of titanium. The mufflers for the
EVOLUTION are available in the same options as the RACING. All metal
elements on the interior of the mufflers are entirely of titanium. The
EVOLUTION2 mufflers are about 1" shorter tucking them nicely in the
undertail while giving them a little louder and deeper rumble. The systems
have a fitting on the Y-connecting tube for installing a lambda sensor. With
Akrapovic
EVOLUTION2 / EVOLUTION / RACING
exhaust systems installed, the motorcycle’s exhaust system will no longer
contain a catalytic converter or EXUP valve.
04-06 Yamaha R1 Evo2 / Evolution
/ Racing Exhaust System Dyno Chart
Power & Torque:Akrapovic
EVOLUTION2 / EVOLUTION / RACING
systems allow the Yamaha engine to breathe to its fullest, as can be seen in
both the power and torque curves. In addition to increased power, the system
levels the power curve into a linear contour. The power increase begins at
the low end at 3400 rpm and lasts up to 4600 rpm. From there to 6200 rpm the
Akrapovic curve follows the stock curve. From 6200 rpm on the curve shows
the qualities characteristic of the top Akrapovic systems. The increase runs
all the way to the top of the rpm range, where it reaches max. power of
160.7 HP at 12730 rpm. The max. increased power is a massive 7.9 HP at 7200
rpm. The torque curve is even more eye-opening, as the system exerts an even
greater influence on the stock curve. The
drop-outs in the
stock curve at around 3600 rpm and 7200 rpm are filled. The engine will be
responsive at
every point, allowing both racing intensity and smooth shifting at low revs.
