You do not have to remove the flapper valve, but if you cut out the box around it then it basically is useless from there on. You shave a few ounces without the flapper and valve, but you would never miss it.
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2001 Suzuki Hayabusa prowler flaming orange pearl, viper black, and chrome decals. *10,272 miles and counting
Micron 4-2-1 race baffle system
Power Comander
K&N air filter
Big air box mod.
kickstand mod.
pair valve eliminated
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