do88 Performance Intercooler – BMW M3 / M4 / M2 Competition (F8x, S55)

OVERVIEW

The S55's top-mounted water-to-air intercooler uses a tube-and-fin core with clamped plastic end tanks. It works at stock boost, but on a tuned M3, M4 or M2 Competition it heat-soaks and the plastic tanks are a weak point. The do88 ICM-320 replaces it with a bar-and-plate core and cast aluminum end tanks TIG-welded to the core.

The core is 85 percent larger than stock, the water side runs dual-pass instead of single-pass, and dense offset fins are used on both air and water sides. do88 developed it with CFD and their SuperFlow bench, and measured 16 percent more airflow and outlet air 9 °C cooler in 0–240 km/h runs. On a Bootmod3 Stage 1 car that was worth up to 13 hp at peak, 25 hp midrange and 52 Nm. It's a drop-in fit with no modifications.

SPECS

• Bar-and-plate core with TIG-welded cast aluminum end tanks
• Core volume: 5,657 cm³ vs 3,052 cm³ OE — about 85 percent larger
• Dual-pass water side (OE: single-pass); high-density offset fins on air and water sides
• Airflow at 0.025 bar (0.36 psi) pressure drop: 298 CFM vs 256 CFM OE — about 16 percent more
• Post-intercooler air temperature: 39 °C vs 48 °C OE at 240 km/h (do88 airstrip testing)
• Measured gains on a Bootmod3 Stage 1 car: up to 13 hp peak, 25 hp midrange, 52 Nm
• Drop-in fitment — no modifications
• Replaces OE 17517846235

PARTS INCLUDED

• 1 × do88 ICM-320 intercooler

TECH RESOURCES

• Required extras: intercooler-circuit coolant to refill and bleed after installation.
• Installation instructions (do88): ICM-320 S55 intercooler installation instructions (PDF)
• Installation notes: drain the intercooler circuit, remove the engine cover and charge pipes, unbolt the OE intercooler, transfer the sensors and fit the do88 unit. Refill and bleed, then check for boost and coolant leaks.
• Pairs well with: the do88 S55 charge pipes (TR-240-SS, TR-250-S) and intercooler radiators (WC-350, WC-360).
• 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).
• 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-320 — do88 Performance Intercooler, BMW F8X M2C / M3 / M4

VEHICLE APPLICATIONS