its a one off pipe, made by a local company here in brisbane, they even went to the trouble of setting it up on the dyno...dont stand close when its running, your ears may bleed and mind your kids it can eat a whole one
Backpressure is never a good thing.
Powerband tuning from an exhaust is the art of exhaust pulse scavenging and gas velocity.
The only reason a bike will run bad because of less backpressure is because the fueling has not compensated for it.
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