Manthey's Porsche Cayman GT4 RS Kit Doubles Down On Downforce

The Porsche 718 Cayman GT4 RS now has its own Manthey kit. The kit does what others before it have done, promising improved performance on an already insanely capable performance machine. Manthey claims a six-second improvement over the RS’ Nurburgring Nordschleife lap time, which falls to 7:03.121.

The improvement comes not from more power- Manthey’s GT4 RS will still make 493 horsepower- but from other changes. Front spring rates rise by 20% on an already stiff car, and a special inverted coilover setup has been co-developed with Porsche. Manthey says compression, rebound, and spring rates can all be adjusted (should you be versed in the wizardry that is suspension geometry). Steel brake lines are fitted as well, and in case you have a little “whoopsie” in your $200K+ sports car, tow loops can be ordered. Cars will be sold in one of two variants, either with or without the axle lift system.

The largest change comes courtesy of aerodynamic improvements, most of which center around revisions to the car’s rear wing. Manthey has added a fourth position for the adjustable wing. At 124 mph in its highest setting, downforce rises from 196 lbs. on the standard GT4 RS to 372 lbs. The tuner says it even had to add carbon fiber reinforcement to the engine cover to help the car cope with the new levels of downforce. An optional $5,890 package swaps the front fender louvers with carbon fiber ones, and the rear ducktail gurney flap with a similarly large and carbon-festooned unit. All this won’t be cheap, of course. You’ll be able to order the Manthey kit through Porsche for a cool $53,946. If that sounds like a lot, the Atlanta and Los Angeles Porsche Experience Centers will make a Manthey-tuned GT4 RS available to drive first.

Become an AutoGuide insider. Get the latest from the automotive world first by subscribing to our newsletter here.

Chase Bierenkoven
Chase Bierenkoven

Chase is an automotive journalist with years of experience in the industry. He writes for outlets like Edmunds and AutoGuide, among many others. When not writing, Chase is in front of the camera over at The Overrun, his YouTube channel run alongside his friend and co-host Jobe Teehan. If he's not writing reviews of the latest in cars or producing industry coverage, Chase is at home in the driver's seat of his own (usually German) sports cars.

More by Chase Bierenkoven

Join the conversation