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motorcycle
Getting back to the original question which was about just changing just the muffler, not the header pipes, My motorcycle would be a good test sled. I haven't changed the muffler yet because the reports from people that have are that it becomes so loud that you will start getting tickets. I also like to keep the cat which is very large and functional in the muffler of the CBR250R. Many dynos have been posted by many different sources and all the different mufflers seem to have the same effect. Big gains in power to the bottom and mid range with less gained on top. If I gain 9% torque at 4000 rpm where I begin my pulses will I gain 9% fuel economy? For the cost of $160 and some extra noise, I might have to find out before my next competition.
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