Revolutionize your stock Porsche 911
flat-six driving experience

The GTk Active Muffler Line from Achtung Kraft is the only muffler line on the market to deliver up to 

6 levels of sound in one muffler. Don't settle for a one-trick muffler - upgrade now to the best for your 

1975 to 1989 Porsche 911, 911S, 911SC and Carerra

1-IN GTk Active Muffler Line for single in 1975+ Air-Cooled Porsches

1-IN Stock Side Exit

This style bolts up to your single out stock exhaust and exits in the same side-out location as a stock muffler. For 1975-89 911S, 911 SC and Carerra stock exhaust setups. This version provides easy installation without the need for additional modifications. It offers 6 distinct sound levels at the flip of a switch. Tailor your driving experience to match your mood or the driving conditions.


1-IN GT3 Style Center Exit

A more aggressive look and sound, this 1-IN GTk Active Muffler offers a center-out GT3 style exit. This muffler delivers a bit more of an aggressive level of sound and performance than the side-out stock location variant, with the added benefit of a sleek and sporty GT3-style exit design. This muffler offers 5 modes of active sounds

at the touch of a button.


1-IN TEST DRIVE VIDEOS // 1976 STOCK 2.7 FLAT-SIX

Hear the amazing flat-six sounds that the 1-IN GT/k delivers

ONE MUFFLER 5-6 DISTICT SOUND LEVELS

Engineered to deliver the sound of 5-6 mufflers in one package (6 side exit vs 5 center)

SILENCER INSTALLED //

3 Levels of Active Sound

Each mode is tuned to keep a mild idle, while unleashing  the roar as the revs climb. With the ability to switch between TOURING, SPORT and YIKES! (with the silencer insert) Porsche enthusiasts can enjoy a versatile and dynamic auditory experience, progressively increasing in aggressiveness and volume, all from this single muffler.

TOURING
SPORT
YIKES!

Touring mode delivers a sporty exhaust note
that is great for everyday drives.


The Sport mode delivers a satisfying growl and increased volume compared to the Touring mode. It is ideal

for spirited driving on winding roads.


Fully opens the bypass to deliver a racecar-inspired sound. Installation of the silencer takes a bit of the edge off

while producing a powerful sound.


NO SILENCER //

3 Additional Levels of Active Sound

Remove the silencers to produce a more aggressive and attention-grabbing exhaust. The muffler comes alive with the sound modes of REBEL, ROWDY and YIKES!!!! All 3 modes are accessed at the touch of the wireless switch to match sound to your driving mood or location.

REBEL
ROWDY
YIKES!!!!

It combines a deep rumble with increased volume, making a bold statement and turning heads wherever you go.

 

On throttle, it unleashes an aggressive and thunderous exhaust note that commands attention

and announces your arrival.

 

Fully opens the bypass, bringing out the loudest of all the modes. True racecar-inspired sounds

at the touch of a button!


ENGINEERED for PERFORMANCE + SOUND

We didn't settle duplicating 50 year old designs. Instead we leveraged advanced technology to create a whole new solution to air-cooled muffler design.

In-depth CAD & CFD design process

Advanced design technology delivered new advancements in muffler design

State-of-the-art analysis coupled with thousands of miles of road testing created the perfect blend of performance and sound quality

At Achtung Kraft, we believe in harnessing the power of cutting-edge technology to design the best mufflers. That's why we utilize advanced Computational Fluid Dynamics (CFD) and Computer-Aided Design (CAD) techniques throughout our design process. By leveraging CFD simulations, we can analyze airflow and optimize the internal structure of our mufflers to maximize performance and efficiency. With CFD and CAD and thousands of road testing miles, we can confidently say that our mufflers are not only visually stunning but also deliver unmatched performance and sound quality on the road.

Rebuildable Silencer Technology

We perfected a silencer insert to give better sound options

Advanced silencer design helps reduce noise while maintaing performance

With the ability to easily remove and replace the silencer, you can fine-tune your exhaust system's sound profile to suit your preference. Our rebuildable inserts are crafted from high-quality 304 stainless steel and quality ceramic packing, ensuring durability and longevity for years to come. And if they ever need a refresh, the design allows a simple and easy rebuild with new ceramic packing.

OUR PROPRIETARY COMPUTER IS IN CONTROL

Delivers wireless on-demand control of the GT/k sound modes

Our control module gives you fingertip control of modes with the flip of a wireless switch

Easy to wire control module just needs (+)Power and (-)Ground and it manages the rest. On start-up the module ensures the valves are all closes for the quietest startup. A wireless, battery operated remote can be mounted anywhwere that triggers the muffler modes with the flip of a switch.With our control module, you can customize your exhaust system's sound to match your mood and driving conditions, ensuring that every journey is tailored to perfection.

The 1-in gt/k active muffler line creates all the sound options of 6 mufflers in one, easy to bolt-on package

The GT/K muffler is the first in the industry  to offer so many sound options in one compact design. 


Search no further for the perfect muffler sound - the GT/k muffler achieves 6 sound options, all at your fingertips!

PRE-ORDER NOW // FOR LATE APRIL 2024 SHIPMENT

1-in-gtk-active-muffler-for-air-cooled-porsches

1-IN GTk Active Muffler for Air-cooled Porsches

$
1850.00
 
$
2000.00
Exit Style
1-IN // Center GT3 Style Out
1-IN // Stock Side Out

TYPICAL LEAD-TIME RIGHT NOW IS 6 WEEKS

Revolutionize Your Flat-Six Driving Experience for Stock Porsche 911 Cars // 911 SC, 911S, Carrera and any stock exhaust from 1974 thru 1989

Engineered to bring the right sound and tone to any air-cooled Porsche and delivers a drone-free driving experience.

Elevate your driving experience with the GTk Active Muffler Line from Achtung Kraft. Designed to deliver unparalleled performance and customization, our mufflers are engineered to meet the demands of discerning drivers.


All mufflers come with our state-of-the-art Custom Control Module that allows wireless control of the different sound modes of each muffler.



Our 1-IN versions of the GTk Active Muffler Line feature two variants to suit your specific needs:



Side-Out / Stock Exit Location: This style bolts up to your single out stock exhaust and exits in the same side-out location as a stock muffler. This version provides easy installation without the need for additional modifications with 6 distinct sound levels at the flip of a switch. You can tailor your driving experience to match your mood or the driving conditions.


Center-Out GT3 Style Exit: For those seeking a more aggressive look and sound, this 1-IN GTk Active Muffler offers a center-out GT3 style exit. This version delivers a bit more aggressive level of sound and performance as the side-out stock location variant, with the added benefit of a sleek and sporty GT3 style exit design and 5 modes of active sounds at the touch of a button.


No matter which variant you choose, you can count on the GTk Active Muffler Line to deliver uncompromising performance, exceptional sound quality, and unmatched versatility. Take your driving experience to the next level with Achtung Kraft.