as stated a few times above teh tune is the key, they are tough little engines!

Im replacing the headgasket with a cometic one and adding arp headstuds, on a stock engine im aiming for over 250rwkw through the auto on E85 on around 22psi... my new one later in the year should make close to 350rwkw.

As Pig said there is the one from Yatala making over 750hp, just depends how drivable you want it and how deep your pockets are