I think I understand what these things give you - they increase dynamic pressure of the air coming into the intake.
This seems like a good thing, as they help the engine breath better, I've heard that you can put these things on w/o having to remap or get a Power Commander.
What I don't understand is: if they increase the amount of air on the intake won't they also make your AFR more lean? Doesn't that argue for getting a Power Commander and remapping if you get velocity stacks?
Puzzled...
Any answers are additionally details would be appreciated.
Thanks,
-Dennis