DesignTek Exhaust

Exhaust heat exchangers, stainless steel
The DesignTek stainless steel exhaust heat exchangers are a high-quality aftermarket upgrade designed for the Porsche 911 3.2 Carrera (1984–1989). Combining exhaust flow efficiency with integrated cabin heating functionality, these units provide a reliable and performance-oriented replacement for original factory heat exchangers.
Sold as a pair

Fits:
Porsche 911 3.2L 1984 - 1989

Heat exchangers play a dual role in classic Porsche engines - they channel exhaust gases away from the engine while transferring heat to the cabin heating system. Over time, original units can corrode or crack due to constant heat cycles and exposure to road conditions, leading to reduced heating performance, exhaust leaks, and potential safety concerns.

Manufactured from durable stainless steel, these DesignTek heat exchangers offer improved resistance to corrosion and long-term durability compared to older mild steel designs. The optimised internal pipework supports better exhaust gas flow, which can contribute to improved engine efficiency and a more responsive driving experience. High-quality materials also help withstand extreme temperatures and vibrations typical of air-cooled flat-six engines.

Designed as a direct-fit replacement, these heat exchangers integrate with standard exhaust systems and heating components, making them suitable for both restoration projects and performance upgrades. Ideal for maintaining originality while benefiting from modern materials, they deliver a balance of reliability, performance, and classic Porsche functionality.

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Related, superseded, cross reference or alternative numbers for comparison.

3606001101

The product you are viewing cross references to these numbers

Exhaust Heat Exchangers, Stainless Steel.
The DesignTek stainless steel exhaust heat exchangers are a high-quality aftermarket upgrade designed for the Porsche 911 2.7L / 3.0L Carrera (1974–1983). Combining exhaust flow efficiency with integrated cabin heating functionality, these units provide a reliable and performance-oriented replacement for original factory heat exchangers.
Sold As A Pair.

Fits:

• Porsche 911 1974-1977 2.7L / 1976-77 3.0 Carrera
• Porsche 911 1978-1983 3.0L

Heat exchangers play a dual role in classic Porsche engines - they channel exhaust gases away from the engine while transferring heat to the cabin heating system. Over time, original units can corrode or crack due to constant heat cycles and exposure to road conditions, leading to reduced heating performance, exhaust leaks, and potential safety concerns.

Manufactured from durable stainless steel, these DesignTek heat exchangers offer improved resistance to corrosion and long-term durability compared to older mild steel designs. The optimised internal pipework supports better exhaust gas flow, which can contribute to improved engine efficiency and a more responsive driving experience. High-quality materials also help withstand extreme temperatures and vibrations typical of air-cooled flat-six engines.

Designed as a direct-fit replacement, these heat exchangers integrate with standard exhaust systems and heating components, making them suitable for both restoration projects and performance upgrades. Ideal for maintaining originality while benefiting from modern materials, they deliver a balance of reliability, performance, and classic Porsche functionality.

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

3606001102

The product you are viewing cross references to these numbers

DesignTek Sport Exhaust muffler / silencer rear box, with valves
with dual center outlet pipes "GT3" style

The DesignTek 'GT3 style' sports exhaust muffler with valves is a performance-focused upgrade designed for classic Porsche 911 models from 1975 to 1989. Combining modern exhaust technology with iconic GT3-inspired styling, this rear silencer enhances both the sound and driving experience of air-cooled 911s.

Fits:
Porsche 911 1975 - 1989

Please note: This system does not come with valve control system. You can add it to the basket afterwards.

This exhaust system features an integrated valve-controlled design, allowing you to switch between a more refined tone and a louder, more aggressive sports exhaust note. When open, the system delivers a deeper, freer-flowing sound with reduced backpressure, while the closed setting provides a more controlled, road-friendly exhaust tone.

Constructed using high-quality materials and precision engineering, this DesignTek muffler is built to withstand the high temperatures and demands of air-cooled engines. Its free-flowing internal design improves exhaust gas evacuation, which can contribute to improved engine responsiveness and efficiency. Performance exhaust systems like this are designed to reduce restriction and enhance airflow, helping engines breathe more effectively.

The GT3-style design brings a modern motorsport-inspired appearance to classic 911 models, typically featuring a more aggressive rear-end look compared to standard silencers. Designed as a direct-fit upgrade, it integrates with existing exhaust components for straightforward installation.

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

3606001103

The product you are viewing cross references to these numbers

DesignTek Sport Exhaust muffler / silencer rear box, with valves, 1 IN 1 OUT
* with tail pipes

The DesignTek 1 IN 1 OUT sports exhaust muffler with valves is a performance-focused upgrade designed for classic Porsche 911 models from 1975 to 1989. Combining modern exhaust technology with the character of air-cooled flat-six engines, this rear silencer enhances sound, responsiveness, and overall driving experience while maintaining a clean, original-style single outlet appearance.

Fits:
Porsche 911 1975 - 1989

Please note: This system does not come with valve control system. You can add it to the basket afterwards.

Featuring a valve-controlled system, this exhaust allows you to switch between a refined, quieter tone for everyday driving and a more aggressive, free-flowing sports sound when desired. This dual-mode functionality gives you the flexibility to enjoy both comfort and performance in one system.

The 1 IN 1 OUT  configuration retains a classic factory-style look while improving exhaust efficiency. The freer-flowing internal design helps reduce backpressure, supporting improved engine breathing and throttle response. Performance exhaust systems are widely used to enhance both sound and engine efficiency, delivering a more engaging driving experience.

Manufactured using high-quality materials and precision engineering, this DesignTek muffler is built to withstand the high temperatures and demands of air-cooled engines. Designed as a direct-fit replacement, it integrates with existing exhaust components for straightforward installation and reliable fitment. DesignTek exhaust systems are known for combining performance gains, durability, and easy installation, making them a popular upgrade choice.


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

3606001105

The product you are viewing cross references to these numbers

DesignTek Sport Exhaust muffler / silencer rear box, with valves, 1 IN 2 OUT
* tail pipes not included.

The DesignTek 1 IN 2 OUT sports exhaust muffler with valves is a high-performance upgrade designed for classic Porsche 911 models from 1975 to 1989. Combining modern exhaust engineering with classic air-cooled character, this rear silencer enhances both sound and performance while maintaining compatibility with original exhaust layouts.

Fits:
Porsche 911 1975 - 1989

Please note: This system does not come with valve control system. You can add it to the basket afterwards.

Featuring a twin-outlet (2-out) design, this system delivers a more aggressive and sporty appearance compared to standard single-outlet silencers, while also improving exhaust gas flow. The valve-controlled system allows you to switch between a refined, quieter exhaust tone and a louder, more aggressive sports sound, giving you flexibility for both everyday driving and spirited use.

Performance exhaust systems like this are designed to reduce backpressure and improve airflow, helping the engine breathe more efficiently and potentially improving throttle response. A freer-flowing exhaust also produces a deeper, more pronounced flat-six exhaust note, enhancing the overall driving experience.

Constructed from high-quality materials and engineered to withstand the heat and vibration of air-cooled engines, this DesignTek muffler offers durability alongside performance gains. It is designed as a direct-fit replacement, making it suitable for restoration projects, upgrades, or replacing worn original silencers.

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

3606001104

The product you are viewing cross references to these numbers

DesignTek Exhaust Tail pipes, RSR Style
* for DesignTek Sport Exhaust muffler / silencer rear box (part number 3606001104)

76mm Straight Outlet 

Fits:
Porsche 911 1975 - 1989

DesignTek Exhaust Tail pipes, Double Walled Slash Cut
* for DesignTek Sport Exhaust muffler / silencer rear box (part number 3606001104)

Fits:

Porsche 911 1975 - 1989