When he was building his own street-legal Batmobile, car aficionado Casey Putsch was such a stickler for detail that he used a real turbine for the engine. It's not the stealthiest engine around, but subtlety, thy name is not Batmobile.
Here's the offical description of Putsch's Fledermaus-themed ride:
The car is a replica of the vehicle from the classic 1989 Batman movie that was directed by Tim Burton starring Michael Keaton as Batman. It is registered and insured for the street and features a military spec Boeing turbine engine that was used in a drone helicopter by the Navy to drop torpedoes on enemy submarines. Putsch taught himself about turbine engines and successfully rebuilt this surplus engine by himself. The engine powers the rear wheels via a semi automatic transmission and is driven like any other conventional production car.
[Via The Escapist]