So I got in the Sparkplugs.com groupbuy last week and it came in today. I'm pretty handy with tools and working on cars, so the install took me about 15-20 minutes working alone.
Problems:
I'm missing one of the couplers (I think it's the 3-1/2"x3"). Should I contact Sparkplugs.com or AFE directly?
Other than that I must say I am VERY impressed with the product. Most of the time I buy car parts and think "there's no way this was worth $XXX." The Stage II is different - it is a really well-made system, and you can tell they only use Grade A parts. I am VERY impressed with the quality. Just taking it out of the box I was excited to see the finish of the box and quality of the filter.
I stuck the 3/4" weatherstripping on the bottom of the box (thank you TitanTalk

), and I don't think I have any noises. My Banks exhaust sounds deeper but that may be in my head.
The performance is unreal. I've put intakes on many cars but never before have they made this much of a gain. I don't want to look like an idiot and guess numbers, I'll just say this is DEFINITELY registered on the butt-dyno. Wow. Seems like a good spread over the powerband also, even throttle-tip in (maybe thanks to their resonated chamber).
Anyways just wanted to let people know what's up, if you have any questions about the system or need pictures let me know.
-Cyrus