Would love to see your head in the flesh Perry, shame your a little swim away!

Cool, cheers. Well my last dyno was 185 @17.5 psi of boost, i think i could happily make 200bhp with efi, better ignition mapping and a different cam (mine was standard). This was on a stage 2 t3 so .36 exhaust housing.

I don't think i would be being too optimistic asking for 250 bhp with a larger exhaust housing, better than stock head with properly matched manifolds and 25psi of boost. Although my head was a DIY attempt, i spent A LOT of time researching and looking at examples, so genuinely think its a good improvement (not the best but better than it was).

But i guess we will see. I really only started the thread to see if people had used the GT2560 before and had any strong opinions of it.