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Porsche 911 991/991.1 Carrera/S 3.4L 3.8L Upgrade GT3 Vacuum Valved Exhaust System
Porsche 911 991/991.1 Carrera/S 3.4L 3.8L Upgrade GT3 Vacuum Valved Exhaust System
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The GT3 Transformation — CEES Porsche 911 991.1 Carrera 3.4L/3.8L to GT3 Conversion Valved Exhaust System
Elevate the aesthetic and acoustic presence of your Porsche 911 991.1 Carrera (3.4L) or Carrera S (3.8L) with the CEES GT3 Conversion Sport Exhaust. This premium system eliminates the restrictive factory side mufflers and rear center muffler, replacing them with a high-flow, center-exit GT3-style architecture. Experience a massive reduction in weight, improved flat-six throttle response, and a soaring, motorsport-inspired scream that rivals the legendary GT3.
🚀 Engineering Highlights
- GT3 Style Center Exit: Completely transforms the rear profile of your standard Carrera or Carrera S into the aggressive, center-exit exhaust layout of the GT3. (Note: Requires a GT3-style rear bumper or custom rear diffuser modification for fitment).
- Vacuum Valve Control System: Total command over your driving experience. Reliable vacuum-actuated valves with an included wireless remote allow you to switch instantly between a refined, drone-free daily mode and an unrestricted, aggressive sport mode.
- Master-Tier TIG Craftsmanship: Hand-welded by specialists from premium T304 Stainless Steel or ultra-lightweight Grade 5 Titanium to ensure uniform weld density and maximum durability under extreme heat.
- Optimized Exhaust Gas Velocity: Engineered with precision mandrel-bent geometry to minimize backpressure, drastically sharpening throttle response and unlocking true flat-six performance.
📊 Technical Specifications
| Fitment | 2011–2016 Porsche 911 991.1 Carrera (3.4L) & Carrera S (3.8L) |
| Material Options | Premium T304 Stainless Steel / Ultra-Lightweight Grade 5 Titanium |
| Valve Type | Vacuum Valve with wireless remote controller kit included |
| Installation Type | GT3 Center Exit Conversion (Requires GT3-style rear bumper) |
| Place of Origin | Guangdong, China (Direct Manufacturer) |
| Warranty | 1 Year |
| What's Included | Valved sport exhaust system + GT3 style tips + vacuum valve controllers + hardware |
✨ Bespoke Your Build — Chat with Our Specialists on WhatsApp
- WhatsApp: +86 15626172519
- Email: cees-exhaust@qq.com
📦 Shipping & Lead Times
- 🛠️ Production Time: Built to order in 2–4 weeks
- 🚚 Shipping: Premium express via DHL / FedEx / UPS — estimated 7–15 business days to your door
FAQ
1. Will this exhaust fit my standard 991.1 Carrera bumper?
No. This is a GT3-style center-exit exhaust. Because the exhaust tips exit in the center, you must install an aftermarket GT3-style rear bumper or modify your rear diffuser to accommodate the center tips.
2. How does the vacuum valve controller work?
The system utilizes reliable vacuum-actuated valves managed by an included wireless remote. With valves closed, exhaust routes through the tuned mufflers for comfortable cruising. Open the valves, and the exhaust bypasses the mufflers for maximum flow and an incredible GT3-style flat-six roar.
3. What is the difference between SS304 and Titanium?
The T304 Stainless Steel variant provides excellent durability and a deep, aggressive rumble. The Grade 5 Titanium version offers massive weight savings over the heavy factory exhaust and produces a distinct, higher-pitched exotic howl synonymous with high-performance Porsche builds.
4. Are you a direct manufacturer?
Yes — as a direct manufacturer based in Guangdong, China, we eliminate middlemen to deliver premium, track-tested exhaust systems with strict in-house quality control and competitive pricing.
