Stainless steel impeller and 20% increase in flow!
affirm Starting At 0% APR - Subject To Eligibility. See Lending Terms When it comes to cooling, Stewart is the final word in high performance pumps. The ultimate in BMW cooling with a limited lifetime warranty!
The MSL thermostat ensures a cooler oil temperature which will result in more stable performance
affirm Starting At 0% APR - Subject To Eligibility. See Lending Terms
A high performance heat exchanger like this will keep the engine at a more consistent temperature and drop intake temps dramatically.
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Brand:
ES#:
3987599
Mfg#:
8131
In Stock
7% off MSRP
MSRP stands for Manufacturer's Suggested Retail Price. This is the suggested retail price provided by the manufacturer, supplier or seller.
$749.00
This product was last offered at the strikethrough price on 06-12-2026
Ditch the weak, factory plastic coolant expansion tank and free up space on the hot side of your engine bay!
affirm Starting At 0% APR - Subject To Eligibility. See Lending Terms 10X Entries For Our 25th Anniversary Sweepstakes! USE CODE TMS20 IN CART FOR BEST PRICE Compatible with factory/aftermarket cold side intakes as well as hot side intakes!
Brand:
ES#:
3647095
Mfg#:
021942TMS13
In Stock
ON SALE!
SAVE 15%
$815.99
This product was last offered at the strikethrough price on 05-02-2026
Upgrade to a much more durable connection from your cylinder head to your thermostat! Commonly referred to as a "Mickey Mouse" flange/adapter.
affirm Starting At 0% APR - Subject To Eligibility. See Lending Terms 10X Entries For Our 25th Anniversary Sweepstakes! USE CODE ECS20 IN CART FOR BEST PRICE
Looks, performance, and reliability - upgrade your cooling system today!
affirm Starting At 0% APR - Subject To Eligibility. See Lending Terms 10X Entries For Our 25th Anniversary Sweepstakes! USE CODE ECS20 IN CART FOR BEST PRICE Upgrade over the OE achilles heel plastic sides and easily-stripped plastic drain plug.
Looks, performance, and reliability - upgrade your cooling system today!
affirm Starting At 0% APR - Subject To Eligibility. See Lending Terms 10X Entries For Our 25th Anniversary Sweepstakes! USE CODE ECS20 IN CART FOR BEST PRICE Upgrade over the OE achilles heel plastic sides and easily-stripped plastic drain plug.
Reduce oil temperatures with the upgraded billet housing and low-temp thermostat! Allows you to add an oil cooler to your vehicle that didn't have the factory option.
affirm Starting At 0% APR - Subject To Eligibility. See Lending Terms 10X Entries For Our 25th Anniversary Sweepstakes! USE CODE TMS20 IN CART FOR BEST PRICE
The MSL thermostat ensures a cooler oil temperature which will result in more stable performance
affirm Starting At 0% APR - Subject To Eligibility. See Lending Terms
Featuring an all-aluminum tank and core. Lower engine temperatures mean more power and longer life of engine components!
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Keep your BMW's B58 engine cool with CSF's performance aluminum radiator!
affirm Starting At 0% APR - Subject To Eligibility. See Lending Terms For vehicles with the M Sport Package (P337A and/or P7B3A)
VRSF front mount intercooler upgrade for B46/B48/B58 M240i, 340i, 440i, 740i, X3 & X4 F20, F22, F30, F32.
affirm Starting At 0% APR - Subject To Eligibility. See Lending Terms We Price Match - Give Us A Call or Chat!
Retains OEM fitment with superior looks and durability. Connectors included!
affirm Starting At 0% APR - Subject To Eligibility. See Lending Terms 10X Entries For Our 25th Anniversary Sweepstakes! USE CODE ECS20 IN CART FOR BEST PRICE
The MSL thermostat ensures a cooler oil temperature which will result in more stable performance
affirm Starting At 0% APR - Subject To Eligibility. See Lending Terms
The MSL thermostat ensures a cooler oil temperature which will result in more stable performance
affirm Starting At 0% APR - Subject To Eligibility. See Lending Terms
Upgrade your cooling system with a bigger, more efficient, radiator, electric fan conversion, water pump, lower-temperature thermostat, and cooling system additives to combat the enemy of performance.
Lifetime Replacement
