http://selindesign.net/parts.html
http://www.z1motorsports.com/product_in ... ts_id=3274
http://www.z1motorsports.com/product_in ... ts_id=2914
as im sure you will notice the descriptions for all 3 of those dual intake systems state they they reduce turbo lag for cars over 500HP. If your car is not a TT do not waste your time with trying to do a dual intake setup it wont do anything for you. If u want to prove im not bullsh*tin you email the gyus at Z1 or ConceptZperformance they'll tell you the same thing.... if you want to get rid of that factory air box just take it off and put a cone filter on the end of the MAF sensor and replace the black plastic intake pipes going to the throttle bodies with aluminum ones(dont have a link for ya sry).... thats about all you can do to an NA intake wise
spend the money on things that'll actually help your car and give you more HP Ex: Exaust, testpipes, down pipes,pullies
im not trying to be harsh

just trying to not let you waste time and money