Has anyone tried Vararam VR Velocity Stacks , throttle-body inserts? They are claiming gains of 22 ft/lbs of torque and 2 tenths and 2 mph on a 2004 Silverado 5.3!

 

People seem to be undecided on them. Do a search in this section of "VR velocity" and you will see where this has been discussed.

 

I had 1 one my truck. They really aren't worth the money. My friend works for Vararam and he told me it was suppose the only give me like 15ft/lbs of torque and 4 hp. I didnt really feel anything with it. I think my truck ran better without it.