Just another opinion....I wouldn't use one unless you don't plan on keeping your rig.
Supposedly those filters do breath better, but at an expense. Racing is where they originated (I think), but those guys tear down their engines every year (or more)....so I'm told by a friend that races short track. He said the trick is to cram the biggest filter/box you can get into the engine bay. <img src="/forums/images/graemlins/lol.gif" alt="" />

shaggy