Whatever you decide to do with the exhaust do not run it without the expansion chamber. You will lose a ton of power if you do. If you really feel compelled you could cut the baffle section of your Bender pipe off (just cut the outer shell all the way around) and then weld on an adapter to the end of the reverse cone that you will expose. You could then run a muffler form a Honda FL350 Odyssey, Honda Pilot, or some other 2-stroke muffler that won't hurt the performance of your engine.
Dave _________________ “The urge to save humanity is almost always a false-face for the urge to rule it.” —H. L. Mencken