Lots of people turn to forced induction for more power these days, but Porsche GT car fans swear by natural aspiration. If you're looking for big power out of your Cayman GT4, but don't want to go the turbo or supercharging route, this engine upgrade from DeMan Motorsport could be the way to go.

The New York-based shop now offers an upgrade package for any Porsche Cayman GT4 street car or GT4 Clubsport race car, increasing the engine's capacity to 4.25 liters (from 3.8 liters), an 11.8-percent increase in displacement. I spoke with founder Rick DeMan, who told me it was demand for more power from customers that drove him to create this engine. He told me an increase in bore from 102 mm to 105 mm combined with a longer stroke, stronger connecting rods, custom pistons, a new crankshaft, and in-house software tuning resulted in some truly impressive power gains.

During dyno testing the team was able to extract 488 horsepower and 360 lb.-ft. of torque from its new engine at the wheels. Factoring in a 15 percent drivetrain loss, that calculates out to 561 horsepower and 414 lb.-ft. at the crank—176 horsepower and 105 lb.-ft. over the stock numbers. Redline has increased to 8000 RPM, though DeMan tells me with titanium internals, that number can be upped to 8500.

Here's a video of the car on the dyno, complete with some fantastic sounds and a bit of exhaust flame:

This content is imported from YouTube. You may be able to find the same content in another format, or you may be able to find more information, at their web site.

This actually isn't the first GT4 engine upgrade DeMan Motorsport has offered. Previously, the shop offered two tiers of 4.0-liter engine upgrades: One with the stock intake, and one with the OEM Carrera S powerkit. DeMan tells me that the 4.0-liter upgrade is now obsolete, as the 4.25-liter engine outperforms it in every aspect.

Of course, an upgrade like this doesn't come cheap. DeMan is asking $28,500 for just the engine upgrade. This doesn't factor in the free-flowing exhaust and Cobb access port you'll also need to extract all the power from the car. DeMan says most people opting for this will have already done those sorts upgrades to their GT4s, which is why the base price is what it is. The shop already has five engines built in anticipation for the announcement, but says it'll take six weeks to perform the upgrades for those who want to keep their original block.

If you're looking for a track-ready Cayman with naturally aspirated GT3 RS power numbers, this might be best way to get it.

This content is created and maintained by a third party, and imported onto this page to help users provide their email addresses. You may be able to find more information about this and similar content at piano.io