New product - VR Velocity stack [Archive] - Hummer H2 Forum: H2 forums

New product - VR Velocity stack

09-04-2003, 03:32 PM
This product is now listed on our website -

Fits all GM V6 and V8 Trucks from 1996-2004 and all GM GenIII V8 equipped cars from 1998-2004.

Designed to produce power and torque throughout the RPM range
Increases throttle response
Increases gas mileage
Increases acceleration
Installs in just minutes!
A patent-pending design!
Eliminates the need for a ported throttle-body by smoothing and reshaping the throttle-body entrance to increase the incoming air velocity at each given RPM

Note: Customers with ported throttle-bodies and or smooth tubes, contact us for a custom made version to fit your application.

In Truck applications we have seen gains of up to 22+ ft/lbs of tire-shredding torque throughout the power curve where you can use it! As tested in a 2004 Silverado 5.3 V8. In LS1 car applications, gains of up to 13 rear wheel HP have been seen (03 C5 Corvette).

The VR velocity stack was designed to reshape the factory throttle-body in order to boost air flow velocity at each given RPM. The overall shape of each VR velocity stack has undergone some of the most intensive airflow research that we have ever done to produce the best overall shape for each engine's airflow requirements. In order to achieve this we:

Created a balanced air stream between the upper and lower portion of the throttle-body blade = more airflow.

We then changed the shape of the entrance to build up a higher velocity charge at each given RPM. This allows the intake charge force in the manifold to be increased = increased throttle response and added torque and power under the curve where you can use it.

Streamlining the intake was also achieved by directing the air in a controlled fashion to reduce any power robbing turbulence over the AIR and PCV valve to maximize the overall efficiency of the factory throttle-body's overall diameter.

Each velocity stack features a varied plenum volume whether in front of the throttle-body or in overall length to help them boost the primary and secondary pressure waves during the cylinder firing process = a tuned and more balanced induction system giving you much better overall combustion efficiency = more power and better gas mileage.

The part number for this product is - vrstack and the price is $49.99.


09-04-2003, 04:54 PM
Heh Tom,

How is it installed or held into place? Any testing with a supercharger? It looks like a good idea.

Thanks, Bill

09-04-2003, 06:51 PM
Installation takes about 5 minutes -

Simply remove your intake hose from the factory throttle-body
Slide the Velocity Stack into your throttle-body.
Re-attach your intake hose to your throttle-body.
Start vehicle and allow a few miles for the factory computer to dial in your air/fuel ratio, your ready to go.

I'm going to use this on my supercharged Suburban so it should be fine.