It's a wiring nightmare. Those modern AMG engines are too integrated with their own electronics. That's why you see more LS and K-swaps; they're way simpler to get running in a different car.

 

Funny, Ive thought about putting our engine into something else, too, but it is far beyond my technical capabilities, and bank account!

 

Lotus has the option. They've already used our engine in a production car.

 

Which Lotus?

 

It's an option to the Toyota motor ...

Yes, Lotus uses a Mercedes-Benz engine in the Lotus Emira, specifically a 2.0-liter turbocharged four-cylinder engine from the Mercedes-AMG M139 unit, paired with an 8-speed dual-clutch transmission, also from Mercedes-AMG. This engine provides 400 horsepower and is a replacement for the V6 engine found in the initial Emira models.
Key Details:
Model: Lotus Emira 2.0T
Engine: Mercedes-AMG M139 2.0-liter turbocharged four-cylinder engine
Transmission: 8-speed dual-clutch transmission (DCT) from Mercedes-AMG
Power Output: Approximately 400 horsepower
Performance: Known for being nimble and fun to drive, with good torque and a quick 0-60 mph time of around 3.8 seconds.

 

FCP Euro did it in MB 190E: FCP Euro - 190E 2.0-16 "Golden Era"

Haven't head of anyone else doing this quite yet.

And yes, I think an AWD CRX with our engine would be insane!!!! (my first car was a 91si, lots of good memories).

 

Haha, I love the creativity here! Swapping an M133 or M139 into something small like a Miata, Mini, or Honda is definitely a wild idea. Those engines are crazy potent for their size—M139 in particular makes nearly 400HP in stock form, so in a lightweight chassis it would be insane.
The main challenges would be mounting, wiring, and cooling. These AMG engines are tightly packaged, and figuring out mounts, transmission adapters, ECU tuning, and exhaust routing would be a serious project. Also, weight balance and drivetrain compatibility (especially if you want AWD) could get tricky fast.
That said, if someone has the fabrication skills and deep pockets, it could be a show-stopper build. Honestly, I’d love to see it done, maybe with a xtryfun touch up paint kit handy too—lots of fab work usually ends up with little scratches or paint chips, and it’s nice to keep the car looking sharp while you’re swapping engines.