Injen says w/the intake and the cold air extension piece (CAE) it will give you 15HP total. Now...that might sound large...but it does give you a decent amount...it'd safely say 10 w/the whole system...CAE and all.
If you want one...get one from
www.enjukuracing.com or some other place...I have been seeing people say that they are going to pay over 200 just for the short ram...I am like NO! Shop around and get different prices and quotes...check your local speed/tuner shops...maybe they can cut you a deal.