do88 Side-Mounted Intercooler Radiator – BMW M3 / M4 (F80 / F82 / F83, S55)

OVERVIEW

The second, smaller radiator in the S55's intercooler circuit sits ahead of the right front wheel. It's the smaller of the two, and on a tuned M3 or M4 it's quickly overwhelmed. The do88 WC-360 replaces it with a core twice the size and adds carbon fiber air ducting between the radiator and the bumper so the air is forced through the core.

do88 3D-scanned the space in front of the wheel arch and made the core 28 mm taller and 28 mm thicker: a 68 mm two-row core with multi-channel tubes. Combined with the do88 front radiator they measured intake air 5 °C cooler at 240 km/h. It fits the M3 and M4 on the factory lines; it is not listed for the M2 Competition.

SPECS

• 68 mm dual-row core with multi-channel tubes; OE-style single-pass flow
• Core 28 mm taller and 28 mm thicker than OE; multi-louvered 8 mm fins
• Core volume: 3,393 cm³ vs 1,693 cm³ OE — about 100 percent larger
• Frontal area: 499 cm² vs 423 cm² OE — about 18 percent larger
• Post-intercooler air temperature: 34 °C vs 39 °C OE at 240 km/h, measured together with the do88 front radiator (WC-350)
• Carbon fiber air ducting to the bumper
• Drop-in fitment on OE lines
• Replaces OE 51748054266 and 17112284604

PARTS INCLUDED

• 1 × do88 WC-360 side-mounted intercooler radiator
• Carbon fiber air ducting

TECH RESOURCES

• Required extras: intercooler-circuit coolant to refill and bleed after installation.
• Installation instructions (do88): WC-360 S55 side-mounted intercooler radiator installation instructions (PDF)
• Installation notes: remove the front bumper and right-side wheel arch liner, drain the intercooler circuit, replace the OE side radiator and duct with the do88 radiator and carbon duct on the factory lines, then refill and bleed.
• Pairs well with: the do88 WC-350 front intercooler radiator and ICM-320 intercooler.
• Tuning: pairs with the Bootmod3 S55 Tune – BMW M3 / M4 / M2 Competition (F8x) and the Burger Motorsports JB4 Tuner – BMW M3 / M4 / M2C (S55, F8x).
• Price is for the item only; labor is not included.

PART NUMBER

• WC-360 — do88 Side-Mounted Intercooler Radiator, BMW F8X M3 / M4

VEHICLE APPLICATIONS