its called muffler for a reason. the baffles reduce the energy of the exhaust gases by making them take a longer route through the exhaust, before exiting at the end. so that reduces the sound emitted, but also creates a certain amount of back pressure which the piston while going up for the exhaust stroke has to overcome to push the gases out properly during the exhaust stroke. This reduces the rev-ability of the engine, but does improve low end torque as well.
The pulsar tuned expansion box for which they have a patent as well ( forgetting the name ), kind of is a balance between the exhaust back pressure and the freedom with which the piston can move, improving performance and efficiency.
So like pointed out above, either use a massive end can, or increase the length of plumbing through which the gas has to travel. but the loss will still count.
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My offerings to the gods of speed -
- KTM Duke 200
- Yamaha RXZ 5 speed
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