do88 Charge Cooler Manifold – BMW G-Series B58 Gen 2 / Toyota GR Supra 3.0 (A90)

OVERVIEW

Every B58 Gen 2 cools its charge air inside a plastic intake manifold with a built-in water-to-air cooler. It works on a stock car, but with a tune or bigger turbo it heat-soaks quickly and the plastic plenum is a known weak point at high boost. The do88 ICM-430-K replaces it with an aluminum manifold built around a 102 mm (4") charge cooler core with 11 water rows, against 6 in the factory part.

do88 measured 26 °C intake air temperature against 41 °C for OE under the same conditions, and 873 CFM against 595 CFM at 0.1 bar pressure drop. On a 2017 340i running Bootmod3 Stage 2+ they saw about 5 hp at peak, 18 hp in the midrange and 28 Nm more torque. A thermal barrier spacer limits heat from the head, and the manifold is ready for later upgrades: 1/8" NPT ports on each runner for methanol or nitrous, a three-port sensor pad, two BSPT ports on the rear water tank, and an outlet tank prepared for auxiliary port injection. For the fuel rail and extra blanking plugs, add the accessory kit or choose the MERA version, which includes them.

SPECS

• Aluminum intake manifold with cast end tanks; replaces the OE plastic manifold
• Air-to-water charge cooler core, 102 mm (4") thick, 11 water rows (OE: 6)
• Intake air temperature: 26 °C vs 41 °C OE (do88 testing)
• Airflow at 0.1 bar pressure drop: 873 CFM vs 595 CFM OE — about 47 percent more
• Measured gain on a 340i with Bootmod3 Stage 2+: about 5 hp peak, 18 hp midrange, 28 Nm
• Thermal barrier spacer with 12 FKM-silicone O-rings
• 1/8" NPT port on each runner; three-port 1/8" NPT sensor pad; two 1/8" BSPT water/bleed ports
• Prepared for auxiliary port injection (ID1050x-34-14 or Bosch EV14 Compact); fuel rail not included
• Fits under OE or aftermarket engine covers with OE mounts
• Replaces OE 11618647977

PARTS INCLUDED

• do88 charge air cooler / intake manifold
• Thermal barrier spacer and 12 × FKM-silicone O-rings
• 4 × brackets, 2 × silicone hoses, 2 × quick-connect adaptors
• 3 × engine cover mounting pins and 1 × spacer Ø12/6.5 × 6 mm
• Hardware: 7 × M6×30, 2 × M6×25, 2 × M6×25 pin screws, 3 × M6×45, 1 × M5×20, 9 × M5×12, 2 × M6 flange nuts, 9 × M6 spring washers, 4 × M6 washers, 4 × M6 thick washers
• 75 cm 12 mm fuel hose, 2 × cable ties, 4 × hose clamps (20–32 mm), 4 × spring band clamps

TECH RESOURCES

• Required extras: charge-cooler circuit coolant to refill and bleed after installation.
• Required for the optional port-injection setup: the do88 B58 manifold accessory kit (ICM-430-440-KIT, fuel rail and plugs — or choose the MERA version, which includes it), injectors such as Injector Dynamics ID1050x, fuel supply and a tune: Bootmod3 B58 Tune – BMW, Bootmod3 – GR Supra, MHD Super License – BMW B58 or MHD Super License – GR Supra.
• Installation instructions (do88): ICM-430-K B58 Gen 2 charge cooler manifold installation instructions (PDF)
• do88 video: do88 B58 charge cooler manifold (YouTube)
• Installation notes: disconnect sensors, coolant lines (pinch them and cap the ports), EVAP parts and wiring, then remove the OE manifold. Fit the thermal spacer, O-rings, silicone hoses and do88 manifold with the supplied brackets, refill and bleed, and refit the engine cover on the adjustable mounts.
• Mild-hybrid (48 V) cars: about 3 mm must be ground from two marked areas on the alternator for clearance — cover the alternator and all head ports first (step 12 of the instructions).
• Torque: manifold M6 flange screws from the center out — 5 Nm twice, then 10 Nm twice, then verify all at 10 Nm; quick-connector hose clamps 5 Nm.
• Bleeding: ignition on (engine off), low beams on, climate at max temperature and lowest fan, accelerator to the floor for 10 seconds; the routine runs 10–15 minutes. Top off afterward. Check hood clearance over the engine cover.
• No CARB EO is published for this part — off-road / competition use only in California.
• Price is for the item only; labor is not included.

PART NUMBER

• ICM-430-K — do88 Charge Cooler Manifold, BMW G-Series (B58) / Toyota GR Supra A90

VEHICLE APPLICATIONS