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ECS BMW Cooling System Parts & Accessories for BMW 3 Series E46 (1999-2005)

The cooling system is arguably the weakest point in numerous BMWs. If you drive an aging BMW or plan on taking your car to the track like we do, we recommend beefing up your cooling system before going to the track. Generally, the main components in your cooling system that are prone to failure include the following: expansion tank, factory hoses, water pump, thermostat, fan (especially if your vehicle comes factory with a clutch fan), and radiator. Factory BMW expansion tanks are plastic and prone to either breaking off at connection points or combusting. As factory rubber hoses age they either crack or break over time - we offer silicone cooling hose upgrades for most applications to avoid future failures. If you have an older vehicle, your water pump likely comes from the factory with a plastic impeller - we offer upgraded water pumps with metal impellers that are far more reliable. Newer model BMWs utilize electric water pumps - BMW spent millions of dollars engineering these water pumps, but they fail so often that we recommend replacing at 60,000 mile service intervals to avoid being stranded on the side of the road. In terms of thermostats, we offer various upgraded thermostats for racing applications. If your BMW utilizes a clutch fan from the factory, we have several options available in terms of universal electric fans - we recommend replacing these to avoid sending brittle plastic fan blades through your hood. For radiators, we recommend swapping out your radiator for one that does not use plastic connection points like your factory radiator.

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E36/E46/Z3/Z4 ECS Tuning Aluminum Water Pump Pulley - Black

10X Entries Into Our F80 M3 Sweepstakes

T#:363707

Part#: 001977ECS03A

In Stock

Sale - Save 5% $ 104.99

This product was last offered at the strikethrough price on
06-13-2026

$ 99.74 USD

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Sale - Save 5%

$ 104.99

This product was last offered at the strikethrough price on
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$ 99.74 USD

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Most of the pulleys on your BMW engine are plastic, which become brittle and frail over time and from engine bay heat. A failed pulley could leave you stranded which is why it is vital to inspect the pulleys during routine maintenance. This is an aluminum version of the stock water pump pulley used on the M50/M52/M52TU/M54 engine in the E36, E46, Z3, Z4, and other models. It uses the same hardware and the original belt as the stock plastic pulley. But the aluminum will last much longer.

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ECS Silicone Radiator Hose Kit (with Connectors) - M52 M54

10X Entries Into Our F80 M3 Sweepstakes

T#:638748

Part#: 006205LA09

In Stock

Sale - Save 25% $ 198.99

This product was last offered at the strikethrough price on
06-14-2026

$ 149.24 USD

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Sale - Save 25%

$ 198.99

This product was last offered at the strikethrough price on
06-14-2026

$ 149.24 USD

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Unlike factory rubber hoses, silicone can withstand higher temperatures and pressures with minimal wear. Rubber will wear out and weaken so don't let it bite you when it counts! Silicone has been proven during extreme racing conditions and won't be the weak link that ruins your day. This kit is specifically designed for the enthusiast that wants uprated cooling hoses, but also wants to address the heat-cycled plastic connectors and O-rings that are also prone to failure in higher mileage or older vehicles.Kit includes a brand new pair of connectors. This E46 NM ECS silicone hose set replaces two hoses - Upper Radiator Hose - 17127510952 Lower Radiator Hose - 11531436408

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ECS E46 M3 Silicone Radiator Hose Kit

10X Entries Into Our F80 M3 Sweepstakes

T#:378149

Part#: 003631ECS01

In Stock

Sale - Save 25% $ 198.99

This product was last offered at the strikethrough price on
06-13-2026

$ 149.24 USD

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Qty

Sale - Save 25%

$ 198.99

This product was last offered at the strikethrough price on
06-13-2026

$ 149.24 USD

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Unlike factory rubber hoses, silicone can withstand higher temperatures and pressures with minmal wear. Rubber will wear out and weaken so don't let it bite you when it counts! Silicone has been proven during extreme racing conditions and won't be the weak link that ruins your day.

This kit is specifically designed for the enthusiast that wants uprated cooling hoses, but also wants to address the heat-cycled plastic connectors and o-rings that are also prone to failure in higher mileage or older vehicles.

This E46 M3 ECS silicone hose set replaces two hoses -
11537830716, upper radiator hose
11537830715, lower radiator hose

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E46 M3, Z4M ECS Tuning Aluminum Water Pump Pulley

10X Entries Into Our F80 M3 Sweepstakes

T#:367060

Part#: 002778ECS01

Ships on Dec 18, 2026

Sale - Save 10% $ 100.99

This product was last offered at the strikethrough price on
06-13-2026

$ 90.89 USD

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Qty

Sale - Save 10%

$ 100.99

This product was last offered at the strikethrough price on
06-13-2026

$ 90.89 USD

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Most of the pulleys on your BMW engine are plastic, which become brittle and frail over time and from engine bay heat. A failed pulley could leave you stranded which is why it is vital to inspect the pulleys during routine maintenance. This is an aluminum version of the stock water pump pulley used on the S54 engine in the E46 M3, MZ3, and Z4M. It's the same size and uses the same hardware and the original belt as the stock plastic pulley. But the aluminum will last much longer.

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ECS Silicone Radiator Hose Kit - M52 M54

10X Entries Into Our F80 M3 Sweepstakes

T#:639004

Part#: 006205LA01

In Stock

Sale - Save 25% $ 160.99

This product was last offered at the strikethrough price on
06-14-2026

$ 120.74 USD

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Qty

Sale - Save 25%

$ 160.99

This product was last offered at the strikethrough price on
06-14-2026

$ 120.74 USD

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Unlike factory rubber hoses, silicone can withstand higher temperatures and pressures with minimal wear. Rubber will wear out and weaken so don't let it bite you when it counts! Silicone has been proven during extreme racing conditions and won't be the weak link that ruins your day. This kit is specifically designed for the enthusiast that wants uprated cooling hoses, but also wants to address the heat-cycled plastic connectors and O-rings that are also prone to failure in higher mileage or older vehicles.Kit includes a brand new pair of connectors. This E46 NM ECS silicone hose set replaces two hoses - Need new connectors included, check out (T#638748) Upper Radiator Hose - 17127510952 Lower Radiator Hose - 11531436408

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BMW E46 M3 ECS Silicone Hose Kit

10X Entries Into Our F80 M3 Sweepstakes

T#:393964

Part#: 003631ECS01KT

In Stock

Sale - Save 25% $ 364.99

This product was last offered at the strikethrough price on
06-13-2026

$ 273.25 USD

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Qty

Sale - Save 25%

$ 364.99

This product was last offered at the strikethrough price on
06-13-2026

$ 273.25 USD

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BMW E46 M3 ECS Silicone Hose Kit: Upgrade Your BMW's Cooling System

Enhances durability and longevity
Resistant to high temperatures and pressure
Improves coolant flow for better engine cooling
Easy to install with no modifications required

Upgrade your BMW's cooling system with the BMW E46 M3 ECS Silicone Hose Kit. This kit is designed to enhance durability and longevity compared to OEM rubber hoses. Constructed from high-quality silicone, these hoses are resistant to high temperatures and pressure, ensuring reliable performance under demanding conditions. Additionally, they improve coolant flow for better engine cooling, resulting in improved overall performance. Installation is easy and straightforward, with no modifications required, making it a convenient upgrade for BMW enthusiasts.

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BMW S54 ECS Exact-fit Waterpipe Connecting Line

10X Entries Into Our F80 M3 Sweepstakes

T#:393388

Part#: 013178ECSKT

In Stock

Sale - Save 25% $ 148.99

This product was last offered at the strikethrough price on
06-13-2026

$ 111.74 USD

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Qty

Sale - Save 25%

$ 148.99

This product was last offered at the strikethrough price on
06-13-2026

$ 111.74 USD

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BMW S54 ECS Exact-fit Waterpipe Connecting Line

Enhance your vehicle’s performance with the BMW S54 ECS Exact-fit Waterpipe Connecting Line, crafted for precision and durability.

Precision Engineering: Engineered to exact specifications for a perfect fit.
Enhanced Cooling: Improves coolant flow for better engine temperature regulation.
Durable Construction: Made from high-quality materials to withstand engine heat and pressure.
Direct Replacement: Installs seamlessly without modifications for hassle-free maintenance.

Upgrade your BMW S54 engine with confidence using the ECS Exact-fit Waterpipe Connecting Line, delivering reliability and performance you can depend on.

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ECS BMW Cooling System Parts & Accessories for BMW 3 Series E46 (1999-2005)

Sub-Categories

E36/E46/Z3/Z4 ECS Tuning Aluminum Water Pump Pulley - Black

ECS Silicone Radiator Hose Kit (with Connectors) - M52 M54

ECS E46 M3 Silicone Radiator Hose Kit

E46 M3, Z4M ECS Tuning Aluminum Water Pump Pulley

ECS Silicone Radiator Hose Kit - M52 M54

BMW E46 M3 ECS Silicone Hose Kit

BMW E46 M3 ECS Silicone Hose Kit: Upgrade Your BMW's Cooling System

BMW S54 ECS Exact-fit Waterpipe Connecting Line

BMW S54 ECS Exact-fit Waterpipe Connecting Line

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