I did a post on that a while ago except it was for the Tornado Air management. Spiral max is just a rip off of the original design. Anyway it works great, it's defently worth the money. There is a noticable difference in acceleration and low end power right after installing it. I think Tornado's address is www.tornadoair.com <img src=/images/forums/snitz/moon.gif width=15 height=15 border=0>
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