These are the second generation design of our wildly popular 2WDW ZX6R Velocity Stacks that we developed a few years ago while building several engines for club level and Moto America racers alike!
We were unhappy with the performance of the other velocity stacks on the market for these bikes. Their either provided significant top end gains at the cost of equal midrange losses, OR they would provide decent mid range gains with virtually no top end performance improvements. These are designed to offer the best of both worlds! With proper ECU mapping to match, you'll pick up 8-10hp at the very top of the RPM range with minimal midrange losses AND a much smoother power curve all the way to 15K RPMs.
We briefly cover the installation of these velocity stacks in this video in the links below.
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As always, if you have any questions, don't hesitate to send us an email at support@2wheeldynoworks.com. We're always happy to help!