How much more gas mileage/performance do you gain with a progressive carb kit?



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Better late than never.

Mileage will improve marginally over a stock carb if it's jetted correctly for your setup.  Performance over a stock carb will be maybe a 5% gain if there's no other changes.  Up to maybe 15% at WOT if the rest of the engine has been modified to match, the cam makes a big difference here.  --Ryan

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