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What kinda exhaust ? Maybe 5hp and replacing the cdi may actually hurt your bike
 

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Like stated above, replacing the CDI is not nesisary unless its bad or you need a timming change due to a highly moded bike such as a 3 plug head
 

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That cdi money if I were you id put it towards a aftermarket air filter
 

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Get a good single like a CT or Sparks or a set of duals. A Pro design intake with clamp on filter and jet kit(GYTR, Vito's, Dyno-jet...). That is the best mods to start with. Don't waste the money on a CDI the 660 has a good stock CDI. Save money and get the stage 2 cam and spring kit and bump up your compression a bit if you ever open up the motor. But you want a good exhaust and intake before you get into the motor.
 

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^yep
 
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