Porsche 718 Cayman GT4 RS Manthey Kit

For the driver who values rarity, engineering purity, and the thrill of owning something few will ever experience. The Porsche 718 Cayman GT4 RS in standard form is already raw, unapologetically focused, and adored by purists.

Fitted with the Porsche Approved Manthey Kit, it becomes something else entirely—an instrument built to communicate every nuance of speed and grip directly to your fingertips and spine.
Its potential isn’t a marketing claim; it’s measured in asphalt: 7:03.121 for a single lap of the Nürburgring Nordschleife (20.8 km).

It’s a package engineered not simply to increase numbers, but to make the car more predictable, more controlled, and more usable at the edge. That is why serious owners seek it: rare factory-level performance, delivered without compromising the OEM warranty.

Note: The components of the 718 Cayman GT4 RS Manthey Kit are engineered as a matched system. They must be installed together.

For availability and consultation, contact Porsche Centre North Toronto Parts Team: 647-925-1390

Aerodynamics Package — Grip You Can Feel, Even in Everyday Driving

The Manthey Aerodynamics Package sharpens the GT4 RS’s character, increasing downforce from 196 lbs to 372 lbs at 200 km/h (89 kg → 169 kg). You don’t need to be on the Autobahn to feel the difference.

Toronto real-world example:
Cruising up the DVP’s long sweeping sections at speed, the car no longer “floats” over uneven pavement. With the Manthey aero, the nose stays planted and the steering becomes calmer—no micro-corrections, just intent.

Calabogie Motorsports Park:
Through the back section, where a normal GT4 RS begins to hunt slightly as the chassis transfers weight, the Manthey front diffuser and aircurtains keep airflow stable. Turn-in becomes measurable rather than reactive—you can position the car with surgical precision.

Canadian Tire Motorsport Park:
On the descent into Turn 4, the widened carbon rear wing and aerodiscs deliver uncanny stability. Where most mid-engine cars feel light, the Manthey GT4 RS feels like it’s being pressed into the surface.

Key aerodynamic components include:

• New carbon front diffuser shaping airflow beneath the car for enhanced grip and steering fidelity.

• Aircurtains, flaps, Radhaus-Gurney elements ventilate wheel housings and increase front axle downforce.

• Aerodiscson the rear wheels to reduce turbulence and improve efficiency.

• Reinforced inner tailgate body structure to withstand sustained aerodynamic loads.

• Carbon rear wing, widened by 85 mm, with integrated Gurney flap and roof-profile shaping—four adjustable positions for circuit tuning.

All elements were validated in the Porsche Weissach wind tunnel—one of the most advanced in the industry.

Air Intake Grill — Track Days Without the Fuss

Manthey’s lattice inserts for the side air inlets catch tire debris and rubber shavings before they enter the cooling ducts.

If you’ve ever tracked a GT car at Calabogie, you’ll understand after every session, the ducts fill with debris from the racing line. With the Manthey inserts, cleanup takes seconds—not disassembly.

Coilover Suspension — Tunable Character, Same Everyday Practicality

The GT4 RS Manthey suspension transforms how the car communicates weight transfer, braking zones, and mid-corner balance.

It uses a threaded chassis with four-way adjustable spring struts and +20% spring rate increase on the front axle, paired with upside-down positive displacement technology. It isn’t merely stiffer—it is faster to react, allowing the chassis to respond before body motion interrupts your steering input.

• Tool-free adjustment of compression and rebound (low/high speed)

• Available for cars with or without front axle lift

Real-life application:

Toronto street use:
Dial in softer low-speed compression and the car absorbs patched asphalt on Bathurst or Lakeshore without tramlining or lurching.

Track use at CTMP:
Increase high-speed rebound and compression, and the car becomes eerily calm through Turn 1—where most drivers tighten their grip instinctively.

Nürburgring-type corners:
The progressive loading through long bends such as the Nürburgring-Nordschleife Pflanzgarten translates to Calabogie’s 13–15 combination—no snap, no hesitation, just a steady stream of front-end information.

Brake Line Harness with Steel Sleeve — Confidence Under Pressure

Hard braking is where Manthey tuning shines. The steel-sheathed brake lines deliver a firmer pedal, consistent bite, and reduced reaction time.

On a day at Mosport, deep braking into Turn 5A becomes repeatable. Trail brake inputs stop feeling like guesswork—they become predictable motions you execute with muscle memory.

For drivers who push aggressively:

• Optional racing brake pads for cast-iron systems

• Stability over wide temperature windows

• Minimal disc attack and consistent friction

Manthey validated this braking system where brakes suffer most—the Nürburgring-Nordschleife.

Additional Components — Functional, Rare, and Purposeful

Manthey isn’t about flash for the sake of flash. Each accessory exists to serve the vehicle or its driver:

Carbon illuminated door entry panels with Red/White Manthey markings—an understated nod to exclusivity.

Optional Manthey door decals (White or Black).

Tow loops for track use (Red, Black, or Yellow) mounted to factory-provided anchor threads—installed for events, removed for street driving.

Carbon rear spoiler attachment: fitted to the factory tear-off edge, adding +4% additional downforce in the high-downforce wing setting.

Visible carbon louvers matching the Weissach Package hood—both functional and visually unique.

Why the GT4 RS Manthey Kit Matters

This kit is not a catalog of parts—it is the result of endurance racing experience distilled into a precision road-legal system. Owners who choose it don’t simply want performance—they want a GT car curated to their ambitions, engineered with Porsche’s blessing, and uncommon enough that other enthusiasts will take notice.

And unlike most performance upgrades, the Porsche Approved Manthey Kit does not affect your OEM warranty when installed through Porsche.

If you’d like to discuss fitment, availability, or track setup recommendations tailored to your driving style—whether for the streets of Toronto, Calabogie, CTMP, or Nürburgring—Porsche Centre North Toronto is here to help. Call the Porsche Centre North Toronto Parts Team today: 647-925-1390