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Porsche > Cayman 987C/981C (2005-2016) > Cayman 2.7L 987C 2006-08 > Engine Tuning >

Thermostats

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Water Thermostat with Thermostat Insert 160F Low Temperature Porsche 986 Boxster / 996 / 987 Boxster / 997 - 99610612553, 99610601359, 99610601361, 99610612554, 99610612153, 99610612155, 99610632650, 99610632651, 99610612552, 99610601360
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Water Thermostat with Thermostat Insert 160F Low Temperature Porsche 986 Boxster / 996 / 987 Boxster / 997
99610601361/1
Product Information
Product Information
160F Low Temperature Thermostat HOUSING WITH INSERT & Gasket for 986 as well as 996 models and replaces the factory 186F thermostat insert, Porsche part numbers 996 106 125 52 (53). Also fits 987 and 997 models to 2008. Does not fit MY09+ DFI engines.

wahler

Fits:
Porsche 986 Boxster 1997-2004
Porsche 996 C2, C4
Porsche 987 Boxster 2005>>
Porsche 997 2005-08

Price includes new low temperature thermostat insert manufactured in Germany by one of the same manufacturers that makes the oe thermostat insert, allowing you to reuse your original housing. Provides increased cooling capacity increasing power while ensuring consistent performance and extending engine-component longevity.

Installation recommended only by trained Porsche technician or Porsche service department using genuine Porsche coolant.

Click 'Zoom in' for large parts diagram.
Diagram Ref No 5, 6 & 7

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Related, superseded, cross reference or alternative numbers for comparison.

99610601361
99610612553
99610601359
99610601361
99610612554
99610612153
99610612155
99610632650
99610632651
99610612552
99610601360

The product you are viewing cross references to these numbers
DISPLAYING 1 to 1 (of 1 products)
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About Thermostats

Porsche Performance Thermostats - Engine Temperature Control Upgrades

Engine Thermostats regulate coolant flow to maintain optimal operating temperature, playing a vital role in Porsche engine performance, efficiency, and longevity. In performance-driven or high-mileage applications, upgraded thermostats help manage heat more effectively, reducing thermal stress and improving overall engine reliability.

Available from Design911, this range of Porsche performance thermostats is engineered to improve cooling response and maintain consistent engine temperatures under demanding conditions such as spirited driving, track use, and tuned engine operation.

What Do Thermostats Do?

Thermostats control when coolant flows between the engine and radiator to regulate operating temperature.

Core Functions:

  • Regulate coolant circulation based on temperature.
  • Help the engine reach optimal operating temperature efficiently.
  • Prevent overheating under load.
  • Improve thermal stability during performance driving.
  • Support consistent engine performance and efficiency.

Accurate temperature control is essential for engine health and reliability.

Why Do Thermostats Fail?

Over time, standard thermostats can degrade due to heat cycling and contamination. Common failure causes include:

  • Wax element fatigue from repeated heat cycles.
  • Sticking open or closed due to internal wear.
  • Coolant contamination or corrosion.
  • Age-related seal deterioration.
  • Increased thermal load from tuned or track-driven engines.

A failed thermostat can lead to overheating, poor warm-up, reduced efficiency, or long-term engine damage.

Why Upgrade to a Performance Thermostat?

Performance thermostats are designed to improve cooling response and reliability.

Upgrade Benefits:

  • Lower opening temperatures for improved cooling control.
  • Faster heat management under high load.
  • Reduced risk of overheating and heat soak.
  • Improved engine longevity in tuned applications.
  • Ideal upgrade for track and performance use.

Upgrading the thermostat helps protect the engine from thermal stress while maintaining optimal operating conditions.

Highlights

  • Porsche performance and low-temperature thermostats
  • Improved engine cooling and thermal stability
  • Ideal for tuned, track, and high-performance engines
  • Helps prevent overheating and heat-related damage
  • Essential upgrade for reliability-focused builds       

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