Posted Tuesday, November 4, 2025 at 8:59pm

The Only Twin-Turbo Flat-Four Ever In A Production Car

Car geeks love a weird flex with their engines, and this one comes straight from Japan. Imagine a flat-four boxer engine with two turbos working in sequence, chasing boost like a rally stage start. The goal was a smoother spool, less lag, and a powerband that felt stacked with torque, not waiting to wake up.

On paper, it sounded like a tuner dream. In the real world, this rare setup built roughly 247 hp and 228 lb ft, and became a folk tale for boost junkies who love oddball engineering. Only one production car ever pulled it off, and then it was relegated to the history books for valid reasons.