well if you're not stuck on NA...i would def go Smallport GZE (AE101 GZE) or if you have alittle extra cash build it up using a 7afe crank and aftermarket 7af rods/wrist pins. this will give you HUGE amounts or tq, basically making a 1.8 liter version of the 4agze....aka a 7agze! also an easy way to 200whp! ...with this set up you may not make more power, but you will hit 15-16psi (aftermarket pulley) before the SR even hits threshold (spools) lol...INSTANT TQ!