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DISPLAYING 1 to 12 (of 12 products)
BBICOOLKIT997T
Product Information
Product Information
BBi Autosport billet aluminium coolant pipe repair kit

bbi

Fits
Porsche 997 Gen 1 Turbo
Porsche 997 Gen 1 GT2

Coolant pipe failure is an inevitable problem with the Porsche GT1-block equipped models (GT3, GT2, Turbo).
Bonded together by adhesives, the factory pipes will eventually leak or abruptly fail. As the best preventative fix and solution for this problem, BBi Autosport offers replacement billet aluminum coolant pipes to be permanently welded in place.
Compared to the factory fittings, these replacement billet fittings offers superior metallurgy to allow stronger, higher quality welds.

Extensive surface preparation and welding skills are required to properly weld the fittings.

The engine requires removing and the necessary components disassembled and thoroughly cleaned, ideally in a ultrasonic cleaner.
Afterwards, the pipes need to be meticulously welded into place and pressure tested for leaks prior to reinstalling the engine.
Special Order item
99710625474
Product Information
Product Information
Coolant return pipe.

porsche

Fits:
Porsche 997.1 Turbo 3.6L / GT2 2007-09
Porsche 997.2 GT2 RS 3.6L 2010-13

Click 'Zoom in' for large parts diagram.
Diagram ref no 4

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99710625474
99710625474
99710625472
99710625471

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99710607
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Product Information
Coolant supply line for the turbocharger. 

Fits:
Porsche 997-1 Turbo / GT2 2007-09 
Porsche 997-2 GT2 RS 2011-13

Diagram reference(s):

No. 11 - Cylinders 1-3
No. 12 - Cylinders 4-6

NOTE: Our product image shows 99710607379, which is for cylinders 1-3.

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99710607
99710607375
99710607376
99710607377
99710607379
99710607474
99710607475
99710607477

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99610622275
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Product Information
Heater hose - Engine to return line.
Genuine Porsche Original Equipment (OE) heater coolant return hose that connects between the engine cooling circuit and the heater return line, ensuring proper coolant flow through the heater core and back to the engine cooling system.

Fits:
Porsche 996 Carrera 2002 - 2005 Tiptronic Gearbox only
Porsche 997.1 3.6L / 3.8L 2004 - 2008
Porsche 997.1 Turbo / GT2 2007 - 2009
Porsche 997.2 Turbo / GT2 RS 2010 - 2013
Porsche 997 GT3 3.8 / 4.0 2009 - 2011

Diagram ref no 42

This hose ensures an unobstructed and secure channel for coolant returning from the vehicle’s heater core to the engine cooling loop, playing a vital role in passenger cabin heating and overall engine thermal regulation. Its precise fit and correct routing are essential to avoid bypassing or pinching, which could otherwise lead to heater inefficiency or premature failure.

Installed between the heater core outlet and the engine’s return fitting, this hose:
Transports heated coolant from the heater core back to the engine cooling system
 Maintains correct flow and pressure balance within the cooling circuit
 Operates under high temperatures and multiple thermal cycles
  Interfaces with factory-specified clamps and hose connections
Because it is made to OE specification, the hose ensures proper sealing and routing that matches the original Porsche design.

A cooling system hose that has become brittle, cracked, swollen, or porous can leak or restrict flow, leading to reduced heating performance, coolant loss, and potential engine overheating. Because the heater return hose carries pressurised coolant across temperature extremes, degradation over time is typical. Replacing it with a Genuine Porsche OE part ensures correct material performance and sealing, helping preserve cooling efficiency and prevent unexpected failures.

When to replace:
  Visible cracks, swelling, or soft spots
  Coolant leaks around the hose ends
  Heater blowing cold air, indicating poor coolant flow
  Cooling system overhaul or heater core service
  Preventive maintenance on high-mile vehicles

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99610622275
99610622275
99610622274
99610622265
99610622266
99610622257
99610622256

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Best Price
99610622275/1
Product Information
Product Information
Heater hose - Engine to return line.
OE Match heater coolant return hose is a direct-fit replacement designed to replicate the original Porsche hose used in the heater return circuit on Porsche 911 996 and 997 models. It carries coolant from the heater core back into the engine cooling system, supporting both cabin heating and overall thermal regulation.

Fits:
Porsche 996 Carrera 2002 - 2005 Tiptronic Gearbox only
Porsche 997.1 3.6L / 3.8L 2004 - 2008
Porsche 997.1 Turbo / GT2 2007 - 2009
Porsche 997.2 Turbo / GT2 RS 2010 - 2013
Porsche 997 GT3 3.8 / 4.0 2009 - 2011

Diagram ref no 42

The hose installs directly using original mounting points and standard Porsche hose clamps, making it suitable for both routine maintenance and larger cooling system overhauls.

The heater coolant return hose channels warmed coolant from the heater core back to the engine’s cooling circuit, completing the heater loop. This allows the cooling system to maintain balanced flow and ensures consistent interior heating performance.

Installed between the heater core outlet and the engine return line, this hose:
  Maintains correct coolant flow and pressure in the heater circuit
  Supports reliable cabin heating
•  Resists collapse, swelling, and heat degradation
•  Integrates with factory hose routing and connections
 Its OE-matched geometry ensures proper clearance and reduces stress on joints and adjacent hoses.

Over time, heater hoses deteriorate due to heat cycling and coolant exposure. A failing return hose can cause coolant leaks, reduced heating efficiency, air ingress into the cooling system, or engine overheating. Replacing worn hoses with an OE Match component restores proper coolant circulation and helps prevent unexpected cooling system failures.

When to replace:
  Visible cracks, swelling, or soft spots
  Coolant leaks around the hose ends
  Heater blowing cold air, indicating poor coolant flow
  Cooling system overhaul or heater core service
  Preventive maintenance on high-mile vehicles

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99610622275
99610622275
99610622274
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99610622266
99610622257
99610622256

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Special Order item
99970741040
Product Information
Product Information
O-ring 39,20 x 3,00 water cooling. 

porsche

Fits:
Porsche 996 turbo - 2000 to 2005
Porsche 996 GT3 - 1999 to 2004
Porsche 997.1 turbo - 2007 to 2009
Porsche 997 GT3 - 2007 to 2011
Porsche Carrera GT - 2003 to 2006
Porsche 918 Spyder

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99970741040
99970741040

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Special Order item
99610680103
Product Information
Product Information
O-ring – 46.7 x 3.53 – used in various applications within the car's cooling system.

Fits:
Porsche 987 Boxster 2005-12
Porsche 987 Cayman 2006-12

Porsche 981 Boxster 2012-16 
Porsche 981 Boxster Spyder 2016 
Porsche 981 Cayman 2014-16 
Porsche 981 Cayman GT4 2016 

Porsche 718 (982) Boxster 2017>> 
Porsche 718 (982) Boxster Spyder 2019>>
Porsche 718 (982) Cayman 2017>>
Porsche 718 (982) Cayman GT4 2019>>

Porsche 996 GT3 / RS 1999-05
Porsche 996 Turbo / GT2 2001-05

Porsche 997 Carrera 2005-12
Porsche 997 Turbo / GT2 RS 2007-13
Porsche 997 GT3 / RS 2007-11

Porsche 991 Carrera 2012-19
Porsche 991 Turbo / GT2 RS 2014-20
Porsche 991 GT3 / RS 2014-21

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99610680103
99610680103

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Best Price
99610680103/1
Product Information
Product Information
O-ring – 46.7 x 3.53 – used in various applications within the car's cooling system.

Fits:
Porsche 987 Boxster 2005-12
Porsche 987 Cayman 2006-12

Porsche 981 Boxster 2012-16 
Porsche 981 Boxster Spyder 2016 
Porsche 981 Cayman 2014-16 
Porsche 981 Cayman GT4 2016 

Porsche 718 (982) Boxster 2017>> 
Porsche 718 (982) Boxster Spyder 2019>>
Porsche 718 (982) Cayman 2017>>
Porsche 718 (982) Cayman GT4 2019>>

Porsche 996 GT3 / RS 1999-05
Porsche 996 Turbo / GT2 2001-05

Porsche 997 Carrera 2005-12
Porsche 997 Turbo / GT2 RS 2007-13
Porsche 997 GT3 / RS 2007-11

Porsche 991 Carrera 2012-19
Porsche 991 Turbo / GT2 RS 2014-20
Porsche 991 GT3 / RS 2014-21

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99610621470
Product Information
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Protective Ring For Engine Coolant Pipe.
Sold Each.
x2 Required Per Car.

Fits:
Porsche 996 Turbo / GT2 2001>>2005
Porsche 996 GT3 1999>>2005
Porsche 997.1 Turbo / GT2 MKI 2007>>2009
Porsche 997.1 GT3 MKI 2007>>2009
Porsche 997.2 Turbo / GT2 RS MKII 2010>>2013
Porsche 997.2 GT3 MKII 2010>>2011

Diagram Ref No 16

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99610621470
99610621470

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Special Order item
99710632872
Product Information
Product Information
Water coolant hose return. 

porsche

Fits:
Porsche 997.1 turbo - 2007 to 2008
Porsche 997.2 GT2 - 2001 to 2012
Porsche 997 GT3 - 2007 to 2012


Click 'Zoom in' for large parts diagram.
Diagram ref no 2 or 45



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99710632872
99710632872

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99710674006
Product Information
Product Information
Water coolant hose, supply.

porsche

Fits:
Porsche 997.1
Porsche 997.2

Click 'Zoom in' for large parts diagram.
Diagram ref no 17

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99710674006
99710674006
99710674004
99710674005

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99710661032
Product Information
Product Information

Water Coolant Pipe, Supply.

porsche

Fits:
Porsche 997.1 2005-08
Porsche 997.2 2009-12

Click 'Zoom in' for large parts diagram.
Diagram ref no 1



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DISPLAYING 1 to 12 (of 12 products)
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About Coolant Hoses - Engine Bay

Coolant Hoses – Engine Bay | Reliable Cooling for Peak Porsche Performance

Coolant hoses in the engine bay are critical components that circulate coolant between the radiator, water pump, and engine block — maintaining consistent operating temperatures and preventing overheating. These hoses carry coolant through high-pressure, high-temperature zones within the engine bay, ensuring your Porsche performs at its best, even under demanding conditions.

At Design911, we stock a wide range of genuine and manufacturer-quality engine bay coolant hoses for Porsche models including 911, Boxster, Cayman. Each hose is designed to fit perfectly, resist extreme temperatures, and deliver long-lasting performance — matching the quality, precision and reliability.

What Do Engine Bay Coolant Hoses Do?

Coolant hoses form part of your Porsche’s closed-loop cooling system. Their job is to:

  • Circulate coolant between the engine, radiator, and water pump.
  • Maintain engine temperature for optimal performance and emissions.
  • Support consistent coolant pressure during operation.
  • Prevent engine overheating and protect internal components from heat damage.

In high-performance engines, such as those found in Porsche vehicles, properly functioning hoses are essential for ensuring precise temperature control and long-term mechanical integrity.

Why Do Engine Bay Coolant Hoses Fail?

Over time, coolant hoses endure constant exposure to heat, vibration, and pressure, which can cause wear and eventual failure. Common causes include:

  • Rubber deterioration from heat cycling and coolant chemicals.
  • Cracking or hardening due to age and environmental factors.
  • Swelling or soft spots from internal coolant corrosion.
  • Leaks at connections caused by weakened hose ends or clamps.
  • Abrasion or rubbing against other engine components.

Symptoms of failure include coolant leaks, overheating, fluctuating temperature readings, or a noticeable smell of coolant in the engine bay.

Why Replace Faulty Coolant Hoses?

A damaged or leaking hose can cause rapid coolant loss and severe engine overheating. Replacing worn hoses ensures your Porsche’s cooling system functions reliably and efficiently.

Benefits of replacement include:

  • Restored coolant circulation and temperature control.
  • Prevention of leaks, overheating, and potential engine damage.
  • Improved reliability and performance under all driving conditions.
  • Manufacturer-quality construction and perfect fitment.

All hoses in this range are built using reinforced, high-grade rubber compounds designed to withstand extreme heat, pressure, and vibration — ensuring lasting durability and peace of mind.

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