The things you find googling... when the Saab engineers of the 50's wanted something more powerful than the original 3-cyl twostroke engine:

they simply twin-coupled two of them

Clocked for 196 km/h (122 mph) on an airfield strip - not bad! They forgot to reinforce the transmission, though, so the lifespan was short...

Sounds like the VAG W* range of engines... eg bolt a couple of V5, or V6 engines together.