disagree with the front mount m8, i know a few people who have run 380+ on a newage STi top mount with no trouble, Craig Mac did it, Andy.F still does it with 450BHP on his Spec C, Gumball did it i "think" Peter (Fai) did it before he went with the front mount and theres plenty others who i cant recall off the top of my head , all of them with no problems, agree he probably will need 550 injectors, disagree he will need anything other than a panel filter as these are seemingly good for 400 BHP+, the only reason most people fit an induction kit is because of the front mount anyway i think Andy.F is still running the standard airbox in his car at 450BHP with silly ammounts of torque
however like i said above im a novice, im not 100% on this