Out the box at the moment I'd say you'll struggle to do better than a 535d which has a twin turbo 3.0 engine producing around 275bhp and more torque than you can shake a stick at. Rest to 100mph is 14.5s so it would match or destroy a classic shape standard scooby in absolutely any test of acceleration other than 0-30mph. Consider what it might do with a remap
Consider also if BMW put that engine in the lighter 3-series and you bought such a vehicle and remapped it. We are then talking about a diesel that is the match of a P1 and effortlessly so. Bold new world