do88 Charge Cooler Manifold – BMW F-Series B58 Gen 1 (M240i / 340i / 440i & More)

OVERVIEW

The B58 Gen 1 in the F-series M240i, 340i and 440i — and early G-series 540i, 740i and X3/X4 M40i — cools its charge air inside a plastic intake manifold with a small integrated water-to-air cooler. Tuned, it heat-soaks quickly and the plastic plenum becomes the limit at high boost. The do88 ICM-440-K replaces it with an aluminum manifold built around a 102 mm (4") bar-and-plate core with 11 water rows against 6 in the factory part.

do88 measured 26 °C intake air temperature against 40 °C for OE under the same conditions, and 873 CFM against 615 CFM at 0.1 bar pressure drop. On a 2017 340i with Bootmod3 Stage 2+ they saw about 5 hp at peak, 18 hp midrange and 28 Nm more torque. A thermal barrier spacer cuts heat from the head, every runner has a 1/8" NPT port for methanol or nitrous, a three-port sensor pad is built in, and the outlet tank is prepared for auxiliary port injection. The spin-on oil filter stays accessible. 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
• Bar-and-plate air-to-water core, 102 mm (4") thick, 11 water rows (OE: 6)
• Intake air temperature: 26 °C vs 40 °C OE (do88 testing)
• Airflow at 0.1 bar pressure drop: 873 CFM vs 615 CFM OE — about 42 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; plugs included
• Prepared for auxiliary port injection; fuel rail not included
• Replaces OE 11618603913

PARTS INCLUDED

• do88 charge air cooler / intake manifold
• Thermal barrier spacer and 12 × FKM-silicone O-rings
• 3 × brackets, 3 × silicone hoses, 4 × quick-connect adaptors
• 3 × engine cover mounting pins and 1 × plastic spacer Ø9/5.4 × 12 mm
• 10 cm 8 mm fuel hose
• Hardware: 7 × M6×30, 2 × M6×25 pin screws, 3 × M6×45, 1 × M5×25, 1 × M5×20, 7 × M5×12, 2 × M5×8, 2 × M6 flange nuts, 7 × M6 spring washers, 4 × M6 washers, 4 × M6 thick washers
• 2 × cable ties, 4 × mini hose clamps, 2 × hose clamps (20–32 mm)

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), injectors such as Injector Dynamics ID1050x, fuel supply and a tune: Bootmod3 B58 Tune – BMW or MHD Super License – BMW B58. With the fuel rail fitted, the engine cover needs the longer pins and the sound deadening removed, and hood clearance is very tight (verified by do88 on the 340i F30/F31).
• Installation instructions (do88): ICM-440-K B58 Gen 1 charge cooler manifold installation instructions (PDF)
• do88 video: do88 B58 charge cooler manifold (YouTube)
• Installation notes: remove the charge pipe, throttle body, strut brace parts and engine cover, disconnect the coolant lines and EVAP (warm the line to release it), and lift the manifold out forward past the harness. Fit the spacer, O-rings and do88 manifold, reconnect, fit the cover mounts and bleed.
• Torque: manifold M6 screws from the center out — 5 Nm twice, then 10 Nm twice, then verify all at 10 Nm; quick-connector clamps 5 Nm.
• Bleeding: run the full bleed routine and top off afterward — trapped air stops charge-cooler circulation and raises intake temperatures. Close the hood carefully to check clearance.
• 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-440-K — do88 Charge Cooler Manifold, BMW F-Series (B58)

VEHICLE APPLICATIONS