Ok, you can reach 300whp with a 16g easily, but not cheaply or quickly. The head and/or the manifold isn't necessary or needed. Neither is the throttle body or maf translator. You need the fmic, heavily ported 2g manifold or a tubular manifold, same for the o2 housing, 2.5/3 inch dp leading to a 3" exhaust, intake, fuel setup consisting of(what I used) 680cc injectors, 255lp(hp) walbro, fpr w/guage, boost controller, boost gauge b/c stock sucks ass, and one step colder plugs if you run high boost....



EDIT: I had the Evo3 gt 16g which is bigger that a regular 16g.....prolly makes a difference and is only like $150 more than the regular evo3....