940 2.3 Turbo (preferably saloon!) (LPT or HPT guise - doesn't matter if you're upping the boost) with an M90 for good measure.
~200bhp on the standard turbo/intercooler/injectors at 13.5psi.
Mine was utter ridiculousness in the wet on its standard 195/65r15s at that sort of boost.
If you're in Poland, a quick jaunt across Germany and into Denmark/Sweden will yield LOTS more of potential motors
Cheers