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- Porsche 911 1965-1968 2.0L / 912 SWB (F)
- Porsche 911 1968-1973 2.2L / 2.4L / 2.7L RS LWB (F)
- Porsche 911 1974-1977 2.7L / 1976-77 3.0 Carrera
- Porsche 911 1978-1983 3.0L / SC
- Porsche 911 1984-1986 3.2L
- Porsche 911 1987-1989 3.2L G50
- Porsche 964 (911) C2 1989-93
- Porsche 964 (911) C4 1989-93
- Porsche 914 (1970-1976)
The GTk Active Muffler Line from Ächtung Kraft is designed to deliver the right sound, performance, no drone and personalized choice in the loudness you want for your Air-Cooled Porsche 911 Flat-Six 911, 914, 964 and Carerra.
The GT/k Active Muffler from Achtung Kraft – the perfect addition to your classic Porsche. This high-performance muffler is designed to optimize your Porsche's performance using the latest active muffler technology, while retaining the classic air-cooled Porsche sound that you know and love. Its active valve system allows you to adjust the exhaust note, giving you a deep, rich tone when closed, and an aggressive race car-inspired sound when opened. It's the ultimate way to enhance your Porsche's performance without sacrificing its iconic sound. Our Active GT/k Muffler offers FOUR distinct sound profiles to ensure that drivers have the flexibility to tailor their vehicle's sound to any occasion, driving style, or personal preference. We have tuned each mode to keep a more mild idle, while unleashing the sounds when the revs climb. With the ability to switch between Touring/Sport (with the silencer insert) or Rebel/Rowdy (no insert), Porsche enthusiasts can enjoy a versatile and dynamic auditory experience, progressively increasing in aggressiveness and loudness, all from a single muffler.
TOURING - CLOSED - with Silencer
The Touring sound profile is tailored for those seeking a refined and sophisticated exhaust note. It provides a mellow and subtle sound, allowing for a comfortable and relaxed driving experience. It is perfect for daily commuting, long highway drives, or occasions when a discreet and elegant exhaust note is desired. Touring mode delivers a sporty exhaust note that is great for everyday drives.
SPORT - OPEN - with Silencer
The Sport sound profile offers a more dynamic and spirited exhaust tone, enhancing the driving experience with a noticeable presence. It provides a deeper and throatier sound, amplifying the engine's performance characteristics when over 2k RPM. Sport mode delivers a satisfying growl and increased volume compared to the Touring mode, ideal for spirited driving on winding roads, or when desiring a more engaging driving experience.
REBEL - CLOSED - NO Silencer
For those seeking a more aggressive and attention-grabbing exhaust note, the Rebel sound profile delivers an assertive and powerful tone. It combines a deep rumble with increased volume, making a bold statement and turning heads wherever you go. Rebel mode is suited for those who want their Porsche to be noticed, and prefer a strong and captivating sound, while still maintaining a refined edge.
ROWDY - OPEN - NO Silencer
The Rowdy sound profile represents the pinnacle of intensity and performance-oriented sound. On throttle, it unleashes an aggressive and thunderous exhaust note that demands attention and announces your arrival. Rowdy mode delivers an exhilarating symphony of sound, providing an experience for those who seek the ultimate in auditory excitement. It is perfect for spirited drives, Rallyes, track days, or anytime you want to showcase the raw sound of your flat-six.
Disclaimer: Please note that our products are designed and intended for off-road use only. The use of our products on public roads and highways is prohibited by law in many areas. It is your responsibility to ensure that the use of our products complies with all applicable laws and regulations in your area. Any use of our products on public roads and highways is at your own risk and could result in damage to your vehicle, injury or even death. By purchasing and using our products, you acknowledge that you have read and understood this disclaimer, and you accept all responsibility and liability for any consequences that may arise from the use of our products.
Please note: This part is on special order terms. Delivery time is normally 8-10 weeks. It is not a subject to cancellation or return if not required.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
AKEXH
The product you are viewing cross references to these numbers
- Porsche 914 (1970-1976)
Has to be used together with:
- 1623101970 / 1623101980 racing type manifolds
- 1620401210 connector tubes

Fits:
Porsche 914/6 2.0L 11/1969-12/1973
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
1620607100
The product you are viewing cross references to these numbers
- Porsche 911 1965-1968 2.0L / 912 SWB (F)
- Porsche 911 1968-1973 2.2L / 2.4L / 2.7L RS LWB (F)
- Porsche 914 (1970-1976)

Fits:
Porsche 911 2.0-2.4L 01/1963-07/1973
Porsche 914/6 2.0L 11/1969-12/1973
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
1620612400
The product you are viewing cross references to these numbers
- Porsche 914 (1970-1976)
Painted steel.
Overall length: 36cm

Fits:
Porsche 914/6 2.0L 11/1969-12/1973
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
1620401210
The product you are viewing cross references to these numbers
- Porsche 911 1965-1968 2.0L / 912 SWB (F)
- Porsche 911 1968-1973 2.2L / 2.4L / 2.7L RS LWB (F)
- Porsche 911 1974-1977 2.7L / 1976-77 3.0 Carrera
- Porsche 914 (1970-1976)
Twin centre outlets, Ø63mm.

Fits:
Porsche 911 2.0L -2.7L 1/63-01/79
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
1620612200
The product you are viewing cross references to these numbers
Sport Silencers
Porsche 2 IN / 2 OUT Sports Silencers - Maximum Flow & Sport Exhaust Sound
2 IN / 2 OUT Sports Silencers are high-performance exhaust components designed for Porsche models with dual inlet and dual outlet exhaust systems. By optimising exhaust flow from both cylinder banks, these sports silencers reduce backpressure, enhance throttle response, and deliver a more aggressive, motorsport-inspired exhaust tone.
Available from Design911, Porsche 2 IN / 2 OUT sports silencers are engineered to provide balanced exhaust flow, improved performance, and a distinctive sound upgrade while maintaining everyday drivability.
What Do 2 IN / 2 OUT Sports Silencers Do?
These sports silencers manage and enhance exhaust flow from dual exhaust banks.
Core Functions:
- Reduce exhaust restriction and backpressure.
- Improve exhaust gas evacuation from both banks.
- Enhance throttle response and power delivery.
- Deliver a sportier, more aggressive exhaust tone.
- Maintain balanced flow across the exhaust system.
Efficient dual-bank exhaust flow is essential for high-performance applications.
Why Do Standard Exhaust Silencers Fail?
Factory exhaust silencers are designed primarily for noise
control and longevity. Over time, they can suffer from:
- Internal corrosion from moisture and heat cycles.
- Restrictive baffling limiting exhaust flow.
- Internal component collapse or rattling.
- Increased backpressure as components degrade.
- Incompatibility with performance tuning upgrades.
Failing silencers can lead to power loss, dull sound, and exhaust leaks.
Why Upgrade to 2 IN / 2 OUT Sports Silencers?
Sports silencers are engineered to enhance both performance and sound.
Upgrade Benefits:
- Improved exhaust flow and reduced restriction.
- More aggressive, performance-focused exhaust sound.
- Enhanced throttle response and engine breathing.
- Durable construction for high-heat environments.
- Ideal for tuned, track, and performance road cars.
Upgrading transforms both the sound and driving experience of your Porsche.
Highlights
- Porsche 2 IN / 2 OUT sports silencer upgrades
- Maximum exhaust flow for dual-bank systems
- Aggressive, motorsport-inspired exhaust tone
- Designed for performance and enthusiast driving
- High-quality materials for durability