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Looking at buying a 70cc big bore kit for my 2009 Yamaha yw50. I am on an extreme budget & cannot afford both a BBK & a performance exhaust. Is there any modifications I can do to the stock exhaust to make it perform better & help me get more power out of a BBK?
 

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Hello Moore_77363,

I had installed a Malossi cast iron big bore kit on my old 2003 Zuma/BWS and kept the exhaust stock. I knew it wasn’t a super fast racing BBK but I got more torque and and a few MPH faster. At least pegged at the maximum on my speedometer. I guess that you could start out with a BBK and maybe later invest in a pipe. Best of luck. 🛵💨
 
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