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.



Features:
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).


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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.

Tom

 

I wouldn't think it would outperform a good ported TB, but who knows.

Tom, why don't you install one of these and post up your results on back to back dyno runs.

 

So this gives more torque but at the cost of horsepower?

 

Is it just me or am I the only one that notices the radical change in A/F? That alone could case the power changes.


Maybe it works maybe it doesn't, sounds weird to me right now though.

 

I'd give up a few HP for more TQ.

 

Yeah... before and after #'s would be nice.

 

Sorry, I am gonna have to throw the Flag on this one. That Dyno is rediculous! The only way to get that "stock" AFR is that they were not full throttle or there is something completely wrong with the vehicle. I saw this the other day on Vararam's website and it is true false advertising.

Sorry, if they want to make that claim they had better have more evidence than "that" Dyno sheet. Come on Tom I know you are smarter than that!

Ryan K.

 

It looks like the IAC and the PCV systems would not like this mod very much either. It covers up those two ports where they vent/pull air.

 

Tom, are you claiming a stock truck has an Air to fuel ratio of 16:1, and this velocity stack reduces it back to where it should be? That sure looks like what is going on with that dyno.

 

i cant buy the stock a/f ratio either, but i can see where it would produce some gains.

if it was running at 16:1 a/f ratio, i wouldnt count on that motor lasting too long.