Gunther Werks has just started production of their seductive Porsche 993 400R at a facility in Southern California.

Based around the 993, either one supplied by the customer or one found by Gunther Werks, the 400R uses a 4.0-liter six-cylinder engine instead of the 3.6-liter unit used by a typical 993. This new engine delivers an impressive 400 hp, a considerable 130 hp more than the stock mill.

As impressive as this engine promises to be, it’s not the most remarkable thing about the company’s 993 400R. What really sets the vehicle apart from all other 911s of its period is the bespoke bodywork that’s similar in some regards to the crazy 911s from RWB.

Up front, the sports car benefits from a new fascia with an enlarged front grille and a pair of voluptuous wheel arches. Elsewhere, the sides include new skirts and custom wheels while the rear end is made up of custom fenders and a towering rear wing with incorporated air intakes to cool the rear-mounted engine.

Gunther Werks will build just 25 conversions, each priced at roughly $525,000, excluding the donor car. Customers will have a number of options to choose from, including the leather trimming and stitching throughout the cabin. The company says it will deliver the first three units by the third quarter of this year.

“We’ve completed final testing and are extremely excited to deliver our clients their 400R conversions,” Gunther Werks founder Peter Nam said.

“Like a handmade suit, each vehicle is tailored to its owner. From the interior and exterior combinations, to the suspension dampening, these vehicles are built to match each customer’s wants and needs.”