JCR Valved Superlight Race Exhaust System & Manifold Assembly for 991.2 Porsche 911 GT3 RS (with OPF) / Speedster

JCR Valved Superlight Race Exhaust System & Manifold Assembly for 991.2 Porsche 911 GT3 RS (with OPF) / Speedster

The JCR Valved Superlight Race Exhaust System & Manifold Assembly for the 991.2 Porsche 911 GT3 RS (with OPF) / Speedster delivers a significant performance boost and extensive customization options, available in Silenced or Non-Silenced configurations to suit either track-focused or more refined driving preferences. It can be specified with optional JCR exhaust tip styles including Titanium Straight, Titanium Megaphone, Titanium Superlight Megaphone, or Inconel Rolled, and finishes such as Polished (inconel), Raw (titanium), or Black Coated. Designed for maximum results, the system offers up to +26hp and +36tq at peak over the OEM exhaust while retaining factory valve control for full compatibility and ease of use.

Light Weight

• Through the use of lightweight materials and intelligent design, JCR has significantly reduced the overall weight of the factory GT3 / RS exhaust components. Removing weight provides clear benefits in any performance vehicle; however, the gains are even more pronounced on this platform, where reducing rear-biased weight distribution enhances overall balance and handling. JCR’s most extreme exhaust solution for this platform removes over 21kg from behind the rear axle, delivering measurable performance benefits in its own right.

Direct Replacement

• All 991 GT3 RS (OPF) & Speedster Superlight Race Exhaust Systems from JCR are 100% direct replacements for the OEM exhaust system. No additional modifications are required during installation beyond removing the OEM part and replacing it with the JCR equivalent, along with any supplied hardware.

Valved Design

• JCR’s Valved version of the center section retains factory valve control via the exhaust button and/or mode switch, allowing the driver to reduce noise when cruising at lower speeds. When the valves open, the sound level matches that of the Non-Silenced system due to the absence of silencing in the valves-open route of the exhaust. All JCR Superlight Race Exhaust Systems feature a tuned merge for improved exhaust scavenging and a smoother, more refined tone. The Valved version maintains the OEM valve switching functionality for a more subtle sound at low speeds and while cruising. Installation simply requires transferring the factory valve motor actuator onto the JCR valve section, ensuring the exhaust functions as per OEM with full control over valve position through the exhaust button and mode switches.

Inconel 625 HJS 200-Cell Race Silencers

• The JCR Inconel Race Silencer replaces the restrictive factory setup with high-flow HJS 200-cell silencers, greatly improving flow and delivering enhanced performance. For vehicles without OPF monitoring, JCR Race Silencers in most cases will not trigger a CEL and do not require tuning. In certain situations, a CEL may still occur, typically if poor fuel quality is used or excessive load is applied before the engine and exhaust reach full operating temperature. As a result, JCR does not guarantee that CEL occurrences are entirely eliminated when these parts are installed.

Titanium Race Silencers

• With the JCR Titanium Race Silencer, the restrictive factory setup is completely removed to achieve maximum performance and sound.

Inconel Race Exhaust Manifolds

• The JCR Inconel Race Exhaust Manifolds are built for maximum performance using lightweight, heat-resistant Inconel 625. They reduce restrictions for quicker throttle response, stronger mid-range torque, and a more aggressive, race-inspired sound. This direct bolt-on upgrade offers substantial weight savings over the OEM system, improving handling by reducing weight over the rear axle.

RSR Sound

• At high RPM, JCR’s Superlight Race Exhaust System configurations produce the signature “RSR” sound that is widely recognized and admired.

Testing Procedure

• As with all JCR products, each system undergoes extensive testing prior to release. Development for this particular product began in 2021.

Power Increase & Real World Performance Improvements

• Every component in the JCR exhaust range is designed to improve horsepower and torque, with results depending on the chosen combination of parts. The Superlight Race Exhaust Systems can deliver gains of up to 26hp and 36tq, alongside improved engine response and stronger mid-range performance. By optimizing manifold design and removing the highly restrictive factory assembly, JCR not only creates a hard-edged race car sound but also dramatically improves flow, increasing power and reducing temperatures significantly under aggressive road or track driving. Testing has shown that the latest generation naturally aspirated OPF-equipped vehicles tend to lose substantial power on longer runs due to excessive heat build-up. The JCR system addresses this, offering more consistent performance and even greater gains during extended track sessions compared to the OEM exhaust system.

Features

• Valved system
• Titanium center & inconel 625 valve sections
• Inconel race exhaust manifolds
• Inconel 625 HJS 200-cell race silencers (silenced version)
• Titanium race silencers (non-silenced version)
• Retains factory valve control
• Compatible with OEM tips
• Optional JCR exhaust tips:
  • Titanium Straight (raw or black coated)
  • Titanium Megaphone (raw or black coated)
  • Titanium Superlight Megaphone (raw or black coated)
  • Inconel Rolled (polished or black coated)
• 14.05kg maximum weight saving vs OEM exhaust (silenced version)
• 17.53kg maximum weight saving vs OEM exhaust (non-silenced version)
• Improved sound quality
• 26hp & 36tq peak increase vs OEM exhaust

Applications

• Porsche 911 GT3 RS: 991.2 (2018-2019) [4.0L F6]
• Porsche 911 Speedster: 991.2 (2019) [4.0L F6]

More JCR Exhaust Products for 991 GT3 RS with OPF and Speedster

• Titanium Valved Race Exhaust System
• Titanium Non-Valved Race Exhaust System
• Inconel Race Exhaust Manifolds (991.2 / 992 GT3, GT3 RS with OPF, GT3 Touring, S/T, and Speedster)
• Exhaust Valve Delete Kit (991.2 / 992 GT3, GT3 RS with OPF, GT3 Touring, and Speedster)
• Titanium OEM-Replacement Megaphone Exhaust Tips
• Titanium OEM-Replacement Straight Exhaust Tips
• Non-Valved Superlight Race Exhaust System & Manifold Assembly

Notes

• In certain situations, a CEL may still occur, typically if poor fuel quality is used or excessive load is applied before the engine and exhaust reach full operating temperature. As a result, JCR does not guarantee that CEL occurrences are entirely eliminated when these parts are installed.
• OEM tips are also compatible
• EU specification cars with OPF monitoring may require an ECU tune to avoid CEL
• Compatible with 991.2 GT3 RS models equipped with OPF

About JCR Developments

JCR Developments is an engineering-led performance brand specializing in high-end exhaust and motorsport-derived upgrade solutions for marquee supercars and enthusiast platforms. Known for its expertise in advanced materials such as Inconel and lightweight stainless alloys, JCR focuses on reducing mass, improving thermal efficiency, and unlocking authentic, emotionally engaging sound without compromising drivability or OEM systems integration. Each component is designed through data-driven development, track-informed testing, and precision fabrication, resulting in products that deliver measurable performance gains alongside elevated craftsmanship. Serving discerning drivers, collectors, and professional build shops worldwide, JCR Developments combines technical rigor with boutique-level customer support to enhance the character, capability, and long-term enjoyment of iconic vehicles.