Re: 12mm vs 14mm bing

andrewhed /
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One is a 12mm in the inside, one is a 14mm in the inside.

The 12 allows for less gas/air mixure to pass into the motor, therefore restricting its performance ( this is quite arguabley the intent as the intake is obviously meant for a 14mm )

taking the 12mm choker off your bike and putting a 14mm on it , along with the matching intake IMO is the most significant performance thing you can do to your bike. Id do it way before a pipe, but everyones different.

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