The BMW B58 engine stands out as the most tunable production engine, with its closed-deck block, forged internals, and advanced cooling system.

BMW's B58 may be the subject of praise and memes online, but its street cred is a result of thoughtful and clever engineering.

Car enthusiasts of a certain age may feel particularly dated by the following fact: the first two powerplants to mark BMW's mass-market adoption of twin-turbo engines are about to start turning 20.