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...not sure if this is of interest to you, but here's a guy nearby in Germany, who would like to exchange his nice and well maintained 996 GT3 for a turbo....
Pulled the cardan shaft and got it dynoed. K24's with the UMW 1 bar wastegate kit, 5 bar fpr, stock fuel injectors, EvoMS airbox/intake, Europipe catted exhaust, 997 GT2RS intercoolers, custom mafless dyno tune with the Cobb accessport. Made 1 bar of boost on the dyno and put down exactly what I was expecting.
Our mods are pretty comparable, except I run 1.3 bar, so it's great to see numbers similar to what I put down last time I had the car on the dyno.
I usually see around 1.1 bar on the street, it made 1 bar on the dyno for whatever reason. I only see 1.3 bar on a boost spike, like changing gears. I may have the turbos rebuilt when I eventually drop the motor for a clutch and addressing the coolant lines. At that point maybe they'll make more boost? I think it's more of a function of the altitude I'm at though...