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I have the Alta intake on my '04, that I put on when the car was new. I can't say the car is a lot faster because of it, but I love the supercharger whine that I hear through the induction system. The stock system damps it out almost completely.
I was going to get the craven speed but WMW talked me into the DDMWorks and I can say I do not regret getting it. I have had it for about 1,000 miles so far and it's been great. Butt dyno says a solid increase and HP and yet again the mention of the awesome supercharger whine.