I made near 400kw with nothing but better valve Springs to hold more boost. No porting or cams or valve upgrades, not even port matching, Just extra boost. 394kw @ 26 psi on a 25/30. Gt35r (2007 spec) 6boob manifold, 3.5" exhaust with 2 massive mufflers so it was 90db @ 3500rpm, 4" intake, 3" intercooler piping, 4" Chinese ebay intercooler and a legit greddy intake manifold with q45 TB. Everyone needs to stop being so girly with their boost levels, turn it up till it stops making power not some silly oh I can't have more than 20 attitude. Learn to not fear the boost but instead embrace it and make bulk midrange power with all that extra air.