Norton Racing Velocity Stacks – Yamaha R3 / MT-03


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After countless hours of dyno testing, our Superbike Velocity Stacks are ready.  The good news is that our system utilizes one of the OEM velocity stacks (the shorter one), so you only need to purchase a single new velocity stack.

Price listed is for one single velocity stack.

***We strongly recommend using our ECU flash or aRacer RC2 ECU paired with the new velocity stacks.  We have re-tuned each cylinder to match the new velocity stack lengths.

*If you have already purchased our ECU Flash for your bike and now you want to install our Superbike Velocity stack, please contact us to update your ECU mapping to match the Velocity stacks.



Norton Racing Superbike Velocity Stack – Yamaha R3

The OEM Airbox in the Yamaha R3 contains two different length velocity stacks, a long one and a short one.  This kit is for one of our custom length Superbike Velocity Stacks to be paired with the shorter OEM velocity stack and used with a modified OEM airbox.  To install this Velocity stack, remove the longer OEM one and replace it with this one.  The performance difference with the Superbike Velocity Stacks compared to the stock setup is dramatic.  For maximum performance, it is recommended to pair this setup with our Race Spec ECU flash.  We have tuning data specifically for this airbox and velocity stack kit to correctly tune each cylinder to the new Velocity stack lengths.  Here’s a dyno comparison with a stock motor and stock airbox vs. modified airbox with Norton Racing velocity stack correctly paired with the shorter OEM velocity stack and tuned only with our matching ECU flash:

Norton Racing Yamaha R3 Superbike Velocity Stacks modified airbox dyno chart graves exhaust

Additional information

Weight 0.2 lbs
Dimensions 4 × 4 × 3 in



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