Heat shield ah, if u can find a way for that it is good lor... I never use lah. Shouldn't be a problem. Just find a drop in filter with the correct size that can fit.
2.0L AMS Performance's 1035hp 4G63 won the Castrol Syntec 2008 Top Shop Challenge by spanking Cosworth's 3.8L VQ35DE and only 'lose' to a Chevy Big Block V-8 7.0L (with three times less hp/L figure)...