If you don't mind me asking what is your full mod list?
My buddy is turboing a fully built 2001 GT and hes expecting to see 800hp and I told him he's crazy.
Unlike your car his is still SOHC and stock displacement.
His mods are:
- Turbonetics GTK 1000 & IC
- Patriot Stage 2 heads (I was against this choice)
- Crower custom cams meant for a S/C (his old setup was a 2.2 KB)
- Built bottom end Cobra crank, HD rods, lower compression pistons (8.7?)
- Full return fuel system
And of course all of the associated bolt-on's and upgrades needed.
A very reputable shop in the area has him thinking 28psi will be ok on a E85 tune and will be around 800hp.
I just don't see it happening do you?