The Manthey Racing Kit: Unlock the Full Potential of Your Porsche 911 GT3 in Santa Clarita
If you already own a Porsche 911 GT3, you know what makes it special: the naturally aspirated 4.0-liter flat-six, the motorsport suspension, the rear-axle steering. But what if you could sharpen that car even further, with parts engineered by the team that campaigns Porsche race cars across the most demanding circuits in Europe?
That is exactly what the Manthey Racing Kit delivers. Available now at Porsche Santa Clarita in Valencia, the Manthey Kit is your path to unlocking more of the capability that the Porsche motorsport program built into the GT3. Note that the kit sharpens aerodynamics, suspension, and braking rather than engine output, so the focus is on handling and track precision, not added horsepower.
That is exactly what the Manthey Racing Kit delivers. Available now at Porsche Santa Clarita in Valencia, the Manthey Kit is your path to unlocking more of the capability that the Porsche motorsport program built into the GT3. Note that the kit sharpens aerodynamics, suspension, and braking rather than engine output, so the focus is on handling and track precision, not added horsepower.
Who Is Manthey Racing?
Manthey Racing is a German motorsport company that is majority-owned by Porsche, which has held a 51 percent stake since 2013. It is one of the most successful names in Porsche racing history. Manthey has won the Nürburgring 24 Hours seven times and campaigns Porsche GT race cars, including the 911 GT3 R and the 911 RSR, at the highest levels of endurance racing. It has been making Porsche road cars faster since the 1990s.
When Manthey develops performance hardware for the street-legal GT3, it carries the full weight of that racing pedigree. The Manthey Racing Kit available in Santa Clarita is not an aftermarket add-on. It is a factory-approved performance package sold through authorized Porsche dealers and backed by the car's engineering and warranty structure.
When Manthey develops performance hardware for the street-legal GT3, it carries the full weight of that racing pedigree. The Manthey Racing Kit available in Santa Clarita is not an aftermarket add-on. It is a factory-approved performance package sold through authorized Porsche dealers and backed by the car's engineering and warranty structure.
What's Included in the Manthey Racing Kit?
The kit is built around aerodynamics, suspension, and braking components developed directly from Manthey's racing program. The exact contents vary by model, so our team can confirm the specification for your GT3, but the package generally includes:
Aerodynamics package: A revised rear wing with a Gurney flap and swan-neck mounts, enlarged end plates, an extended rear diffuser, front lip and diffuser refinements, front canards, an optimized underbody, and carbon aerodiscs on the rear wheels. Together these add downforce and high-speed stability, which is particularly valuable on fast circuits like Laguna Seca.
Coilover suspension: The adaptive dampers are replaced with a four-way adjustable coilover setup, adjustable for compression and rebound at high and low speeds, with stiffer front spring rates. This reduces body roll and sharpens turn-in for track days at Chuckwalla, Buttonwillow, or any of SoCal's circuit venues.
Braided steel brake lines: Firmer, more consistent pedal feel through repeated heavy braking, with optional fade-resistant performance pads available for cars fitted with the ceramic brake option.
Optional lightweight wheels: A lighter forged wheel set is available to reduce unsprung weight, working with the aerodiscs for further aerodynamic efficiency.
Every component is engineered specifically for the 911 GT3 platform, so the car retains its factory balance and its drivability on public roads in the Santa Clarita Valley.
Aerodynamics package: A revised rear wing with a Gurney flap and swan-neck mounts, enlarged end plates, an extended rear diffuser, front lip and diffuser refinements, front canards, an optimized underbody, and carbon aerodiscs on the rear wheels. Together these add downforce and high-speed stability, which is particularly valuable on fast circuits like Laguna Seca.
Coilover suspension: The adaptive dampers are replaced with a four-way adjustable coilover setup, adjustable for compression and rebound at high and low speeds, with stiffer front spring rates. This reduces body roll and sharpens turn-in for track days at Chuckwalla, Buttonwillow, or any of SoCal's circuit venues.
Braided steel brake lines: Firmer, more consistent pedal feel through repeated heavy braking, with optional fade-resistant performance pads available for cars fitted with the ceramic brake option.
Optional lightweight wheels: A lighter forged wheel set is available to reduce unsprung weight, working with the aerodiscs for further aerodynamic efficiency.
Every component is engineered specifically for the 911 GT3 platform, so the car retains its factory balance and its drivability on public roads in the Santa Clarita Valley.
What Does the Manthey Kit Feel Like to Drive?
Drivers who have installed the Manthey Racing Kit consistently report a sharper, more communicative car. The suspension changes are the most immediately noticeable: turn-in is more direct, body roll is further reduced, and the rear of the car feels more planted under acceleration out of corners.
The braking character also improves. With more consistent pedal feel through repeated braking events, you can push deeper into corners with confidence, exactly the kind of feedback Manthey's racing background is built on.
Despite the performance gains, the kit maintains everyday usability. The Manthey-equipped GT3 is still a car you can drive to our Cars & Coffee events in Santa Clarita, then straight to a track session without reconfiguring anything significant.
The braking character also improves. With more consistent pedal feel through repeated braking events, you can push deeper into corners with confidence, exactly the kind of feedback Manthey's racing background is built on.
Despite the performance gains, the kit maintains everyday usability. The Manthey-equipped GT3 is still a car you can drive to our Cars & Coffee events in Santa Clarita, then straight to a track session without reconfiguring anything significant.
Does the Manthey Kit Void My Warranty?
This is the most common question from GT3 owners considering performance upgrades, and the answer with the Manthey Racing Kit is more reassuring than with most aftermarket options.
Because the kit uses original-equipment parts and is sold through authorized Porsche dealers, it is developed in compliance with Porsche engineering standards. When installed correctly by a Manthey-certified dealer, the factory warranty remains intact on unaffected systems.
Our service team can walk you through exactly what applies after installation. You can also take advantage of our Porsche scheduled maintenance plan to keep your upgraded GT3 operating at factory spec.
Because the kit uses original-equipment parts and is sold through authorized Porsche dealers, it is developed in compliance with Porsche engineering standards. When installed correctly by a Manthey-certified dealer, the factory warranty remains intact on unaffected systems.
Our service team can walk you through exactly what applies after installation. You can also take advantage of our Porsche scheduled maintenance plan to keep your upgraded GT3 operating at factory spec.
Professional Installation at Porsche Santa Clarita
The Manthey Racing Kit is not a weekend garage project. Proper installation requires factory-level tooling, alignment calibration, and technicians who understand the GT3's suspension geometry. Our factory-trained, Manthey-certified installation service ensures every component is fitted precisely, with a full four-wheel alignment performed afterward to verify the car's geometry meets Manthey's specifications.
What to expect at our service center:
Manthey Racing Kit installation by factory-trained, Manthey-certified technicians Post-installation four-wheel alignment to dial in suspension geometry Full inspection, including an engine inspection, before and after installation on request Access to service and parts specials for GT3 owners Scheduling through our online service scheduler for your convenience
Is the Manthey Kit Right for You?
You are an ideal candidate for the Manthey Racing Kit if:
You track your 911 GT3 regularly and want to improve lap times without building a full race car You have maxed out what you can extract from the stock GT3 setup and want more precision You want factory-approved performance hardware with warranty-compatible installation You are preparing for a serious driving event, such as a session at the Porsche Experience Center Los Angeles, and want to arrive with a properly sorted car
If you are still in the market for a GT3, browsing our GT3 inventory near Valencia, CA, is the logical first step, and then we can discuss how a Manthey kit transforms an already extraordinary car into something even closer to a race vehicle.
If you are still in the market for a GT3, browsing our GT3 inventory near Valencia, CA, is the logical first step, and then we can discuss how a Manthey kit transforms an already extraordinary car into something even closer to a race vehicle.
About Porsche Santa Clarita
Porsche Santa Clarita is your authorized Porsche dealer serving Valencia, Santa Clarita, and the greater Los Angeles area. Our team includes dedicated Porsche product specialists and factory-trained service technicians who live and breathe this brand. Learn more about our dealership or schedule a service appointment to discuss the Manthey Racing Kit for your GT3.
Ready to go further? Explore the Manthey Racing Kit for your 911 GT3 in Santa Clarita or call our performance parts team to discuss installation timing and pricing.
Ready to go further? Explore the Manthey Racing Kit for your 911 GT3 in Santa Clarita or call our performance parts team to discuss installation timing and pricing.