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Porsche > 911 & 912 (1965-1989) > 911 1974-1977 2.7L / 1976-77 3.0 Carrera > Exhausts >

1 IN / 2 OUT
Sports Silencers

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DISPLAYING 1 to 5 (of 5 products)
Exhaust & Heat Exchanger Twin Outlet System Porsche 911 1974-83 - 93011116905, 93021102901, 93011104300, 93011104303, 93011118303, 93011118306, 93011323009, 93011323015, 93011323025, 93011312328, 9301132318, 93011323019
1
Exhaust & Heat Exchanger Twin Outlet System Porsche 911 1974-83
EXHAUSTKIT20
Product Information
Product Information
Exhaust & Heat Exchanger Twin Outlet System Porsche 911 1974-83

1 x Stainless steel Sports exhaust with twin big bore 84mm outlets.
2 x Stainless steel heat exchangers.
1 x Stainless steel Standard pre-silencer.
1 x Stainless steel cross over pipe.

offering more bhp and a fuller sound.

Fits:
Porsche 911 2.7L / 3.0L 1974-83

Please note: It is illegal to fit this product for road use on type-approved vehicles first used on or after 1/3/2001


Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.

EXHAUSTKIT20
93011116905
93021102901
93011104300
93011104303
93011118303
93011118306
93011323009
93011323015
93011323025
93011312328
9301132318
93011323019

The product you are viewing cross references to these numbers
Exhaust kit for Porsche 911 2.7-3.0L Rear box 1IN - 2OUT, Outer diameter 84mm. - 1620000910, 92.287SD, 1623103500, 1620400400, 1620401000, 1620200600, 1620604400, 1621701910, 1621701510, 1621401970, 1621101200, 1625000300, 1625001100, 91.101S, 92.102S, 92.103S, 92.300S, 92.502SD, PCG91121100, 91.101KIT, 93011115900, 91111119101, 90007428202, 90091009702
1
Exhaust kit for Porsche 911 2.7-3.0L Rear box 1IN - 2OUT, Outer diameter 84mm.
EXHAUSTKIT1030
Product Information
Product Information
Exhaust kit, Stainless steel, 1 IN - 2OUT, Outer diameter 84mm.

dansk

Fits:
Porsche 911 2.7-3.0L 08/73-10/83

Please note: It is illegal to fit this product for road use on type-approved vehicles first used on or after 1/3/2001


Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.

EXHAUSTKIT1030
1620000910
92.287SD
1623103500
1620400400
1620401000
1620200600
1620604400
1621701910
1621701510
1621401970
1621101200
1625000300
1625001100
91.101S
92.102S
92.103S
92.300S
92.502SD
PCG91121100
91.101KIT
93011115900
91111119101
90007428202
90091009702

The product you are viewing cross references to these numbers
1-IN GTk Active Muffler for Air-cooled Porsches 911 SC, 911S, Carrera 1974 - 1989 - 91111102501, 93011102200, 93011102203, 91111102504, 93011103700, 93011104301, 93011104303 - 1IN_GTK_CENTER, 1IN_GTK_STOCK
10
1-IN GTk Active Muffler for Air-cooled Porsches 911 SC, 911S, Carrera 1974 - 1989
AKEXH
Product Information
Product Information
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.

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.

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.

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
91111102501
93011102200
93011102203
91111102504
93011103700
93011104301
93011104303

The product you are viewing cross references to these numbers
Exhaust muffler / silencer rear box twin outlet. With TÜV/EEC approval Porsche 911 1974-89 - 92.502SD, 92502SD, 93011102200, 93011104300, 1620604400 - 92.520SD, 1620604400
1
Exhaust muffler / silencer rear box twin outlet. With TÜV/EEC approval Porsche 911 1974-89
91122092502SD
Product Information
Product Information
Sports exhaust stainless steel with big bore Ø84mm TWIN outlet, offering more bhp and a fuller sound.

With TÜV/EEC approval 

danskmotorsport   tuv

Fits:
Porsche 911 1974-89 2.7 / 3.0 / 3.2



Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.

91122092502SD
92.502SD
92502SD
93011102200
93011104300
1620604400

The product you are viewing cross references to these numbers
Exhaust muffler / silencer rear box, Sport, 'GT3' style. Porsche 911 75-89 - 1620614300, 92.501GT, 93011102200, 93011102203, 93011104300, 93011104301, 93011104303 - 1620614300
9
Exhaust muffler / silencer rear box, Sport, "GT3" style. Porsche 911 75-89
1620614300
Product Information
Product Information
Exhaust muffler / silencer rear box, Sport, with dual center outlet pipes "GT3" style, aluminised, grey heat-resistant paint.

danskmotorsport

Fits:
Porsche 911 Carrera 3.2L  08/1983 - 07/1989
Porsche 911 SC / 911 Carrera 2.7L-3.0L 08/1975 - 07/1983

Perfect for your G-model 911. 

This dual centre-exit exhaust, made from aluminised steel, is specially crafted to keep the sound level at "speech level" while driving. At idle, the car sounds potent and sporty. City driving and cruising are no louder than 76 dB in the car. Resonance/drone is close to zero! Under heavy acceleration and sporty driving, it produces a powerful - but subdued sound that never gets too loud. Does not exceed 85 dB when driving hard. The favourite and obvious choice.



Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.

1620614300
1620614300
92.501GT
93011102200
93011102203
93011104300
93011104301
93011104303

The product you are viewing cross references to these numbers
DISPLAYING 1 to 5 (of 5 products)
Also found on these pages
About 1 IN / 2 OUT
Sports Silencers

Porsche 1 IN / 2 OUT Sports Silencers - Enhanced Sound & Performance Exhaust

1 IN / 2 OUT Sports Silencers are performance exhaust components designed to split exhaust flow from a single inlet into dual outlets, improving exhaust efficiency while delivering a more aggressive and balanced exhaust note. This configuration enhances both performance and aesthetics, making it a popular upgrade for performance-focused Porsche owners.

Available from Design911, Porsche 1 IN / 2 OUT sports silencers are engineered to reduce exhaust restriction, improve throttle response, and produce a deeper, sportier sound while maintaining daily drivability.

What Do 1 IN / 2 OUT Sports Silencers Do?

These sports silencers optimise exhaust flow and sound through a dual-exit design.

Core Functions:

  • Split exhaust flow for improved gas evacuation.
  • Reduce backpressure compared to standard silencers.
  • Enhance exhaust sound and tone.
  • Improve throttle response and power delivery.
  • Support performance and visual upgrades.

Balanced exhaust flow is essential for both performance and sound quality.

Why Do Standard Exhaust Silencers Fail?

Factory exhaust silencers are designed primarily for noise reduction and emissions compliance. Over time, common issues include:

  • Internal corrosion from moisture and heat.
  • Restrictive baffling limiting exhaust flow.
  • Rattling or collapsed internal components.
  • Increased backpressure reducing performance.
  • Incompatibility with performance exhaust upgrades.

Failing silencers can lead to power loss, poor sound quality, and unwanted noise.

Why Upgrade to a 1 IN / 2 OUT Sports Silencer?

Performance sports silencers are engineered to improve exhaust flow and sound.

Upgrade Benefits:

  • Improved exhaust gas flow and efficiency.
  • Deeper, more aggressive exhaust tone.
  • Enhanced throttle response and drivability.
  • Dual outlet design for improved aesthetics.
  • Durable construction for long-term performance.

Upgrading delivers noticeable performance and sound improvements while enhancing the vehicle’s appearance.

Highlights

  • Porsche 1 IN / 2 OUT sports silencer upgrades
  • Improved exhaust flow and performance
  • Sportier, more aggressive exhaust tone
  • Dual outlet design for visual impact
  • Designed for road and performance use

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