German sports car gets a stronger American heart from a Ford Mustang.

With the new 718 Cayman, Porsche has decided to downsize from a naturally-aspirated six-cylinder engine to a turbocharged four-cylinder unit as a way to boost efficiency without ruining performance. Some aftermarket specialists are seeing things differently as they have decided to do the exact opposite: upsize.

They took out the Cayman’s factory flat-six engine and stuffed inside a meaty 5.0-liter V8 Coyote engine from a Ford Mustang. As a result of the heart transplant, the coupe’s power has jumped from 257 hp (191 kW) and 218 lb-ft / 295 Nm (as tested on the dyno with another Cayman that had a stock engine) to a massive 424 hp (316 kW) and 364 lb-ft (493 Nm).

If that doesn’t sound impressive, we need to point out the figures shown on the dyno at Florida-based Power By The Hour Performance represent the power at the rear wheels. In other words, the crank horsepower should be well above 450-460, so we could be dealing with a tuned Cayman that can truly go head to head with the 911, at least on the straights.

The heavier engine certainly has had an impact on the car’s weight distribution, which might have affected handling a little bit. But with significantly more power than the regular Porsche Cayman, we’ll let that one slide. If you’ll ever get the chance to hop inside the V8-powered coupe, you will probably need a pair of earplugs taking into account the Coyote engine is positioned literally behind the front seats, so you can imagine the noise it makes.

If you are a big fan of engine swaps, this latest build reminds us of another car that has been recently subjected to a V8 heart transplant, a Mazda MX-5 fitted with an LS3 V8. There's also a Viper V10-powered BMW Z4 out there if you're into that sort of thing. In the age of downsizing for the sake of boosting miles per gallon numbers, it seems some of the tuners are going against the tide, and we’re ok with that.


Gallery: Porsche Cayman receives Ford 5.0L V8 conversion