do88 Auxiliary Radiators (Pair) – BMW M2 / M3 / M4 (G87 / G80 / G82, S58)

OVERVIEW

The S58 cools the engine through three front radiators: one large center radiator and two smaller auxiliary radiators, one ahead of each front wheel. A tuned engine makes a lot more heat than the stock cooling package was sized for, and the auxiliary radiators are an easy place to add capacity. The do88 WC-440 pair replaces both with all-aluminum units that have 43 percent more core volume than stock.

Each radiator uses a two-row, 48 mm core for about 13 percent more active cooling area, with TIG-welded tanks, CNC-machined brackets and OE-style quick-connect fittings. Because the factory radiator is the same on both sides, the do88 part drops into either side, and they are sold as a pair since upgrading just one side gives little benefit. The factory rock guards bolt straight on.

SPECS

• All-aluminum construction with TIG-welded end tanks
• Core volume 43 percent larger than OE
• Two-row core, 48 mm thick; about 13 percent more active cooling area
• Larger coolant capacity than OE
• CNC-machined mounting brackets
• OE-style quick-connect inlet and outlet fittings
• Drop-in for left and right sides; accepts the OE rock guard
• Replaces OE 17118095285

PARTS INCLUDED

• 2 × do88 performance auxiliary radiators (left and right)

TECH RESOURCES

• Required extras: engine coolant to refill and bleed the system after installation.
• Installation information: do88 does not publish a separate manual for this part. The auxiliary radiators sit behind the front bumper ahead of each wheel; remove the bumper and wheel liner access as needed, drain the cooling system, release the quick-connect fittings and brackets, swap the radiators, transfer the OE rock guards, then refill and run the factory bleed routine.
• Tip: doing both sides at once is recommended — do88 sells the radiators as a pair for that reason.
• Tuning: no tune is required; aimed at tuned and tracked cars. Pairs with the Bootmod3 S58 Tune and MHD Super License – S58.
• Price is for the item only; labor is not included.

PART NUMBER

• WC-440 — do88 Auxiliary Radiator, BMW M2 M3 M4 G80 G82 G87 (S58), pair

VEHICLE APPLICATIONS