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High Performance Cooling System Upgrade - E46 M3

10X Entries Into Our F80 M3 Sweepstakes

T#:557315

Part#: E46MPCKT

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Sale - Save 2% $ 2,201.99

This product was last offered at the strikethrough price on
08-24-2026

$ 2,166.03 USD

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Sale - Save 2%

$ 2,201.99

This product was last offered at the strikethrough price on
08-24-2026

$ 2,166.03 USD

Add to Wish List

If you plan to drive your BMW aggressively on the track, it is important that you upgrade your cooling system to avoid overheating. To ensure your BMW keeps cool on the track, we have built out our new High Performance Cooling System Upgrade kits. Featured in this kit is everything you will need to redo your cooling system from top to bottom with OEM components, with select stock components swapped out for the high performance alternative! This kit includes a high performance Mishimoto Radiator for significantly better cooling than the stock radiator and full aluminum construction that won't crack from long term heat cycling, and a Genuine BMW Motorsport 55*C thermostat, for lower temperature operation and increased cooling of the engine.

Additional items included in this kit:

ECS Tuning Silicone Replacement Coolant Hoses - For increased reliability over stock rubber hoses
ECS Tuning Heavy Duty Aluminum Bleeder Screw
OEM Expansion Tank, Cap, and Level Sensor
OEM Belts, Tensioners, and Pulleys
OEM Auxiliary Fan Switch
Genuine BMW Hardware for Easy Installation
ECS Tuning Aluminum Water Pump Pulley - For increased reliability over the stock composite pulley

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Auxiliary Fan Switch

Mounted in upper radiator hose, controls operation of auxiliary fan

2X Entries Into Our F80 M3 Sweepstakes

T#:376847

Part#: 13621433077

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$ 10.99 USD

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$ 10.99 USD

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Comes with related o-ring

Motorsport Thermostat - 55 (NO LONGER AVAILABLE)

T#:337991

Part#: 11531417215

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Starting at $ 233.98 USD

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Starting at $ 233.98 USD

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E46M3 Motorsport Thermostat 55C (Also fits Euro E36 M3 engine) A Genuine BMW part this thermostat opens at a much lower temperature than stock to keep your S54 engine (or Euro S50/S52 engine) running cooler in race applications.

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DO88 Coolant Hoses - Blue - E46 M3

T#:13924830

Part#: DO88KIT70B

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$ 256.99 USD

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$ 256.99 USD

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Made out of high-quality silicone, these hoses display the highest levels of durability and quality. With three to five layers of armory the hoses are designed to withstand high pressure and heat for an extended period of time. The OE hoses are known to crack and leak but this hose kit eliminates any chance of that.

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BMW Radiator Hose Kit - 11537830715

2X Entries Into Our F80 M3 Sweepstakes

T#:46719180

Part#: CHK0376R

Ships in 4 Business Days

$ 43.99 USD

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$ 43.99 USD

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Keep your cooling system sealed, strong, and ready for anything with this Rein radiator hose kit—your all-in-one fix for cracked, leaking, or worn factory hoses. Years of heat, pressure, and age can cause rubber to weaken, split, or swell, setting the stage for coolant leaks and potential overheating. Rein hoses are engineered to meet or exceed OEM standards, built from premium, heat-resistant materials that can take on extreme temperatures and system pressures without faltering. Each hose features factory-correct bends, fittings, and diameters for an exact, hassle-free installation—no cutting or forcing required. Whether you’re tackling a full cooling system refresh or chasing down a small coolant leak, this Rein kit provides everything needed to restore confidence and performance under the hood. Why choose this Rein radiator hose kit: Factory-level precision – Direct-fit replacements that deliver OEM-quality reliability. Built to last – Resists cracking, swelling, and chemical damage from daily heat cycling. Confidence restored – Prevents coolant loss, overheating, and on-road breakdowns. All-in-one upgrade – Includes upper and lower hoses for a complete system refresh. If keeping your BMW’s cooling system running tight and trouble-free is the goal, Rein brings the dependable quality and fitment you can count on—engineered to perform just like factory, mile after mile.

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Radiator Support Bracket

2X Entries Into Our F80 M3 Sweepstakes

T#:14122755

Part#: 17117514402

Back Ordered

$ 8.99

This product was last offered at the strikethrough price on
08-13-2026

$ 8.24 USD

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$ 8.24 USD

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Mounts to top of radiator bracket, 2 per vehicle.

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High Performance Cooling System Upgrade - E46 M3

Auxiliary Fan Switch

Motorsport Thermostat - 55 (NO LONGER AVAILABLE)

DO88 Coolant Hoses - Blue - E46 M3

BMW Radiator Hose Kit - 11537830715

Radiator Support Bracket

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