BMW 5 Series E34 (1987-1995)

Aluminum Thermostat Housing Kit - M50

T#:397222

Part#: 14-009

Ships on Sep 16, 2026

$ 56.99 USD

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$ 56.99 USD

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Plastic thermostat housing cracked on your M50?

Here are your choices: you can wait for the plastic factory thermostat housing cover to break and cause major overheating. (Even with a new stock cover, it won’t take long.) Or you can install a thoughtfully engineered all-aluminum thermostat housing cover from Active Autowerke and never experience this type of failure again. Currently there is no factory upgraded part to this problem. This is an aluminum extruded part that has all of the openings machine properly to fit like factory; from the mounting bolt holes, the seating of the thermostat to the sealing opening for the ORANGE gasket. Forged to exact factory tolerances, everything fits and this unit is a true easy bolt-on – especially suited for racing or load conditions like heavy traffic, where engine temp can rise rapidly. The housing is guaranteed never to break from overheating or over-tightening, and its CNC machined surface ensures a precise seat.

Unit comes complete with a new ORANGE sealing gasket; a new thermostat is recommended but not included.
For hotter climates, a 71 degree thermostat is recommended over the 82 degree unit.

Anything and everything BMW is the mantra at Active Autowerke. Since 1981 they have been serving the BMW community with custom turbocharger kits to a myriad of other innovative and inspiring performance parts.

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Active Autowerke Rotrex Traction Fluid - One Liter

T#:397307

Part#: 12-032

Ships in 4 Business Days

$ 240.00 USD

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$ 240.00 USD

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Rotrex superchargers utilize a unique traction drive system that sets it apart from other centrifugal-style superchargers. For best performance, Rotrex recommends replacing this fluid every 50,000 miles. This bottle of traction fluid is plenty enough for one supercharger service (typically 750ml).

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Active Autowerke Signature Trunk Emblem

T#:590914

Part#: AASIGNATUREPLAQU

Ships in 4 Business Days

4% off MSRP $ 45.00

MSRP stands for Manufacturer's Suggested Retail Price. This is the suggested retail price provided by the manufacturer, supplier or seller.

$ 43.00 USD

Only available at this price

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4% off MSRP

$ 45.00

MSRP stands for Manufacturer's Suggested Retail Price. This is the suggested retail price provided by the manufacturer, supplier or seller.

$ 43.00 USD

Only available at this price

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Stand out from the crowd, and give them a hint of what you've got going on under the hood, with the official Active Autowerke Signature Emblem! The emblem can be placed anywhere on the exterior, or interior of your BMW. Hefty stainless steel construction and durable double-sided tape will help ensure that it is never lost, even at speeds over 170+ MPH...Don't ask us how we know! Represent your favorite BMW tuner for all to see today!

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Radiator Relief Flush

T#:375297

Part#: 040202

In Stock

$ 13.99 USD

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$ 13.99 USD

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Keep your BMW's cooling system in top condition with DEI's Radiator Relief™ Cooling System Flush. This concentrated cleansing agent effectively removes rust and mineral deposits from the radiator core and hose lines, restoring efficiency. Additionally, it dissolves oily residue build-up left by old antifreeze and coolant mixtures, ensuring optimal performance. Simple to use and 100% biodegradable, this flush is recommended for use with distilled water to maintain optimum efficiency. Note that it is intended for a complete coolant flush and should not be added to existing coolant.

Benefits:

Removes rust deposits from radiator core and hose lines
Dissolves oily residue for improved performance
Restores cooling system efficiency
Simple to use
100% biodegradable

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Aluminum Thermostat Housing Kit - M50

Active Autowerke Rotrex Traction Fluid - One Liter

Active Autowerke Signature Trunk Emblem

Radiator Relief Flush

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