you only got 1 option. bpd.
i put one in my 4wd tx3. got 150 awkw, with a catback, vr4 cooler and a pod filter. was running 14psi, and the stock cat was restrcting it big time.
a b6t would be the easiest upgrade though.
ps the bpd's arnt forged, they a squeeze cast. the rods are awesome on them though.
steve.