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On my Kawasaki ninja 250 I wasnt going to fork out $4-500 for a exhaust system, so I took the exhaust off and drilled about 30 or more 3/8 holes in the header, then paid about $50 for exhaust silencer packing and exhaust wrap to silence it a bit!! Now it sounds like a mild Harley!! ���� and I also put pod filters on, and am now getting an average 75.5mpg. And after the last tank I installed a 16t front sprocket with the stock 45t rear.
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