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

OVERVIEW

The MERA is the top version of do88's B58 Gen 2 charge cooler manifold. It replaces the factory plastic manifold and its small integrated cooler with an aluminum manifold built around a motorsport-grade Garrett bar-and-plate air-to-water core, 102 mm (4") thick with 11 water rows against 6 in the factory part.

do88 measured 23 °C intake air temperature against 41 °C for OE under the same conditions, and 874 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. Unlike the standard ICM-430-K, the MERA kit comes with the AN-8 auxiliary port-injection fuel rail and the EVAP and crankcase blanking plugs, so it is ready for port injection out of the box. It keeps the thermal barrier spacer, runner injection ports, sensor pad and bleed ports, and the spin-on oil filter stays accessible.

SPECS

• Aluminum intake manifold with cast end tanks; replaces the OE plastic manifold
• Garrett bar-and-plate air-to-water core, 102 mm (4") thick, 11 water rows (OE: 6)
• Intake air temperature: 23 °C vs 41 °C OE (do88 testing)
• Airflow at 0.1 bar pressure drop: 874 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
• Auxiliary port-injection fuel rail with AN-8 female threads included; suits ID1050x-34-14 or Bosch EV14 Compact injectors
• 1/8" NPT port on each runner; three-port 1/8" NPT sensor pad; two 1/8" BSPT water/bleed ports
• Thermal barrier spacer with 12 FKM-silicone O-rings
• Replaces OE 11618647977

PARTS INCLUDED

• do88 MERA charge air cooler / intake manifold
• Fuel rail with 2 × M6×20 screws; EVAP blanking plug; crankcase connection blanking plug
• 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 to use port injection: 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. A small engine-cover modification is needed when the fuel rail is fitted.
• Installation instructions (do88): ICM-430-G MERA B58 Gen 2 charge cooler manifold installation instructions (PDF)
• do88 video: do88 B58 charge cooler manifold (YouTube)
• Installation notes: same procedure as the standard manifold — disconnect sensors, coolant lines, EVAP and wiring, remove the OE manifold, fit the spacer, O-rings, hoses and do88 manifold, then refill and bleed.
• Mild-hybrid (48 V) cars: about 3 mm must be ground from two marked areas on the alternator for clearance (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.
• 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-G — do88 Charge Cooler Manifold MERA, BMW G-Series (B58) / Toyota GR Supra A90

VEHICLE APPLICATIONS