@ all who's interested in upgrading his Turbo to an GT 30 R and won't drive ext. gated, here are some pics from an GT 30 R with int. wastegate A/R 0.68 housing and 100 mm inlet, good for nearly 500 bhp with 0.68, you can also get it with 0.86 and 1.06 for more bhp but with more lag.
Fit it with 0.68 and self made exhaust (modifide) 4x4 manifold on my RUSH Cossy.
Get an good price in Germany.
Yours
Ronny