Gunther Werks Builds Custom Porsche 993 Restomod
The modified sports car utilizes a twin-turbocharged flat-six engine to reach 850 horsepower.
Updated on Oct. 9, 2026 in Performance Vehicles
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Gunther Werks has unveiled a custom Porsche 993-based vehicle featuring a high-performance 4.0-liter flat-six engine. This bespoke machine delivers up to 850 horsepower when operated in its dedicated track mode.
Why it matters
This build showcases the extreme potential of air-cooled Porsche platforms when paired with modern engineering and forced induction. It highlights a growing trend of boutique manufacturers pushing legacy vehicle performance beyond original factory specifications.
The vehicle is powered by a twin-turbocharged 4.0-liter flat-six engine producing 600 pound-feet of torque and an engine redline of 7,500 rpm. Stopping power is managed by six-piston front Brembo calipers with 13.9-inch discs and four-piston rear calipers with 13.5-inch discs.
The players
Gunther Werks
This California-based company specializes in high-end restomods and bespoke modifications for classic Porsche models.
Rothsport Racing
An Oregon-based automotive shop known for building high-performance engines and components for air-cooled Porsches.
The details
Developed with engine manufacturer Rothsport Racing, the powertrain incorporates billet barrels, Mahle pistons, and forged conrods alongside individual throttle bodies. The cabin is trimmed in a combination of blue suede, leather, and carbon fiber to match the aggressive mechanical upgrades.
Timeline
October 8, 2026: Official details were published regarding the custom build.
Roadmap
This project reflects the broader automotive industry shift toward restomodding, where boutique firms modernize classic chassis with contemporary power levels. It demonstrates how independent builders are successfully maintaining the relevance of iconic platforms against modern supercars.
Prospective buyers should expect a significant investment, as these bespoke builds command premium pricing reflective of their complex engineering. Owners will benefit from modernized braking and power delivery, though they should anticipate higher maintenance demands than a standard production vehicle.
The takeaway
This vehicle demonstrates that classic air-cooled engines can achieve modern supercar output when integrated with sophisticated turbocharging systems. Enthusiasts looking to replicate such performance should prioritize professional engine builder collaborations to ensure long-term reliability.
Further reading
For more on high-performance builds, see our Performance Vehicles section.
Source note: This article includes information reported by Carscoops.
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