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Been doing some research on various bikes on db killers and back pressure. Amazingly on various sites and dyno charts ive foundthat db killers installed make more power than without. It's because of back pressure and other physics outside of my pay grade. Found a triumph speed triple putting out 7 more hp with db's installed. These results were more common on bikes with cat delete pipes as a cat would cause some back pressure. I just found this interesting.
 
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