i wouldn't say that much hp increase but you will notice a better throttle response and rev quicker. maybe more like 3 or 4 hp gains. oh and the sound.... you'll just die when you hear it, sounds so sick!
is it worth it? HELL G YEAH!
definitely worth it. dont worry about all the hydrolock hype. very rare does that happen..i've had a CAI on the last three cars i've owned and it rains fairly heavy in jersey now and then..never once have i had a problem. makes the most power out of any "intake"..especially in the summer times when its real humid out. makes a huge diff
In a word .... YES!! Get it, you'll be glad you did!!! And as mentioned above, don't worry too much about the hydrolock issue you are likely going to hear in this thread. I live in Houston and we get some bad rain sometimes and I have never had an issue. Just be smart and stear clear of puddles and deep water and you'll be fine.
have any of you seen the dyno's on Oscar Jackson's site?
They put an aftermarket intake in (Volant) and came up with very little gain...put the stock one back in and put a K&N drop-in in there and measured a gain of 7hp. Kinda makes you wonder eh? Our stock intake is actually a CAI w/ a touch of ram air.
While all the aftermarket parts look good, I sometimes wonder if I would have done just as good or better with the drop in vs. the short ram.
Well I just orderd one from a local "rice" shop for pretty cheap. Im not worried at all about the hydrolock concerns, it rarely rains in san diego and when it does i'll just slap the stock one on for peace of mind.
check ebay. i found mine extremely cheap!!!! hardly used and came with everything and a reoiled filter for get this... $80 Shipped!!!!  i cleaned all the aem logos and stickers off and hightemp painted it orange.
i didn't get the AEM lisence plate frame cover though 
Well i installed the intake, and let me tell you it looks sexy as hell, the blue matches the color fairly well. I noticed a little bit of an increase in hp/torque, but nothing too significant. It sounds pretty bad ass though, is it supposed to whistle around 3000 rpms?
thought I would add that I just removed my AEM... I got tired of the filter getting soaked in heavy rains, missing in partial throttle acceleration after the filter got wet, and just overall displeasure and work trying to keep that stupid "dryflow" filter dry.
the stock air box w/ K&N filter = no difference in performance that I can feel or my GTech Pro can detect. (And I know the GTP isnt really an accurate measurement... but if the lack of the CAI doesnt move its numbers at all... its benifits were far less than required to make the maint, and worry worth it. )
Also the fit/finish lacked some... I love how the AEM grinds on the clutch line on the tranny... thats hot stuff right there.