A good sleeper shouldn’t sound powerful idling at the lights, so no V8s. And huge tyres on the back are also a giveaway but a powerful RWD car without decent rear tyres can’t make use of excessive power, so you want AWD with subtly wider wheels and the grippiest tyres available.

So, Nissan Stagea wagon. The early models looked somewhat similar to a Volvo wagon of the same era, and the drivetrain was AWD Skyline based. Carefully remove any badges, wings, scoops or other performance-suggesting body parts, fit suitable widened steel wheels and performance tyres, then insert the most powerful RB26-based engine the aftermarket can build, plus whatever drivetrain upgrades necessary to get all the power to the wheels.