Mishimoto MMTS-E46-99V2 Racing Thermostat for 1999-2006 BMW M52/M54/M56

Regular price: $135.95
Regular price: ~~$150.00~~
Sale price: $135.95

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In Stock: 14

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Product Specification:

SKU:MISMMTS-E46-99V2

MPN: MMTS-E46-99V2

UPC: 840197701133

Weight: 0.9 lb

Inventory: 14

Type: Thermostats

Vehicle Fitment

1999-2000 BMW 323i/323is (E46, M52/M54 engines)
2000 BMW 323Ci (E46, M52/M54 engines)
2001-2006 BMW 325Ci/325i/325xi (E46, M52/M54 engines)
1999-2000 BMW 328i/328Ci (E46, M52/M54 engines)
2001-2006 BMW 330i/330xi/330Ci (E46, M54 engines)
1999-2000 BMW 528i (E39, M52 engines)
2001-2005 BMW 525i/530i (E39/E60, M54 engines)
1998-2002 BMW Z3 (E36/E85, M52/M54 engines)
2003-2006 BMW Z4 (E85/E86, M54 engines)
2001-2006 BMW X3 2.5i/3.0i (E83, M54 engines)
2001-2006 BMW X5 3.0i/4.4i/4.6is/4.8is (E53, M54 & related engines)

Features

Racing-style thermostat designed for BMW cooling performance
Activates ~48 °F (27 °C) earlier than stock - begins opening at ~158 °F (70 °C)
Direct OEM-style fit with pre-installed thermostat in housing
Includes thermostat housing gasket for installation
Improves coolant flow and heat dissipation under load
Helps maintain lower operating temperatures on modified engines
Durable OEM-quality housing with Mishimoto Lifetime Warranty
Ideal for daily, track, and performance driving conditions

Specifications

Part Number: MMTS-E46-99V2
Thermostat Activation Temp: ~158 °F (70 °C)
OEM Activation Temp: ~206 °F (97 °C)
Included: Thermostat with housing and sensor
Included: Thermostat housing gasket
Warranty: Mishimoto Lifetime Limited Warranty

Included Components

1x Racing thermostat with housing and sensor
1x Thermostat housing gasket

Product Description

The **Mishimoto MMTS-E46-99V2 Racing Thermostat** is a high-performance cooling upgrade engineered for BMWs equipped with **M52, M54, and M56 series engines**, commonly found in E46, E39, E53, E83, E85, and related chassis from the late-1990s through mid-2000s. Unlike stock thermostats that begin opening at ~206 °F (97 °C), this performance thermostat opens significantly earlier (~158 °F/70 °C), allowing coolant to circulate sooner and helping reduce peak engine temperatures under spirited driving or high-load conditions.

Designed as a **direct-fit replacement**, the MMTS-E46-99V2 comes **pre-installed in an OEM-style housing** and includes the necessary **thermostat housing gasket**, simplifying installation and ensuring a secure seal. It fits a wide range of BMW vehicles - from 323i and 325i/E46 variants to 330i, 525i, Z3, Z4, X3, and X5 models - all within the chassis types that use the M52, M54, or M56 engine platforms. Backed by the Mishimoto Lifetime Warranty, this thermostat is a reliable choice for enthusiasts looking to improve cooling efficiency on both stock and modified engines.