[98SteedaGT]

I think someone asked how they work. Here's how:

An intake spacer adds length to the intake runner(s), this gives the incoming air more space and time to pick up velocity. You want your intake air to be fast and not to sit around in your manifold. Some spacers have a helix like design on the inside edge, this is supposed to swirl the air, this in turn (like rifling on a gun barrel) keeps the air moving forward and helps it to maintain velocity. -- Think of it this way, if you have ever watched a river that is very high and running fast, if you notice, there are some parts where there's debris or other objects in the path of the water, this causes the current to swirl around it and sometimes cause it to get stuck in a mini-loop (just spinning around in the same place), you do not want this to happen to the air intake on your car. This will decrease your car's ability to function as it can not breath properly. --Now, as far as how well these things work, that is still being debated.