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

OVERVIEW

The S55 in the F80 M3, F82/F83 M4 and F87 M2 Competition uses a top-mounted water-to-air intercooler, plastic charge pipes and two small radiators to cool the charge circuit. Once the car is tuned, all of it becomes a limit: intake temperatures climb, and the plastic pipes are known to crack at the turbo connections. The do88 BigPack bundles do88's S55 upgrades into one kit at a lower price than buying them separately.

Every version is built around the do88 ICM-320 bar-and-plate intercooler, with a core 85 percent larger than stock. Choose it with the aluminum charge pipes (turbo-to-intercooler pipes and the J-pipe to the throttle body), with both upgraded intercooler-circuit radiators (front and side-mounted), or with everything. do88 measured up to 13 hp at peak, 25 hp midrange and 52 Nm on a Bootmod3 Stage 1 car, with intake air 9–14 °C cooler and 16–17 percent more airflow depending on the version. The versions with radiators do not fit the M2 Competition.

SPECS

• Intercooler: do88 ICM-320 bar-and-plate core with TIG-welded cast end tanks, 85 percent larger than OE, dual-pass water side
• Pipes (pipe versions): do88 TR-240-SS 2.25" aluminum turbo-to-intercooler pipes and TR-250-S 3.5" cast aluminum J-pipe with two 1/8-27 NPT ports
• Radiators (radiator versions): do88 WC-350 front intercooler radiator (75 percent more core volume) and WC-360 side-mounted intercooler radiator (100 percent more core volume)
• Measured gains on a Bootmod3 Stage 1 car: up to 13 hp peak, 25 hp midrange, 52 Nm
• Intake air temperature 9–14 °C lower and 16–17 percent more airflow, depending on version (do88 testing)
• Drop-in fitment
• Replaces OE 17517846235, 11617846245, 11617846246, 11617848447, 11618057992

PARTS INCLUDED

• Intercooler + Pipes (BIG-250-SS): ICM-320 intercooler, TR-240-SS turbo-to-intercooler pipes, TR-250-S J-pipe
• Intercooler + Radiators (BIG-250-WC): ICM-320 intercooler, WC-350 front intercooler radiator, WC-360 side intercooler radiator
• Intercooler + Pipes + Radiators (BIG-250-WC-SS): all of the above
• Silicone hoses, clamps and hardware as supplied with each component

TECH RESOURCES

• Required extras: intercooler-circuit coolant to refill and bleed. Screws, nuts or gaskets may need replacing on older cars. Radiator versions do not fit the M2 Competition (F87).
• Installation instructions (do88): ICM-320 intercooler instructions (PDF)
• Installation instructions (do88): TR-240-SS turbo-to-intercooler pipe instructions (PDF)
• Installation instructions (do88): TR-250-S J-pipe instructions (PDF)
• Installation instructions (do88): WC-350 front intercooler radiator instructions (PDF)
• Installation instructions (do88): WC-360 side intercooler radiator instructions (PDF)
• Installation notes: fit the intercooler and pipes first, then the radiators if included; refill and bleed the intercooler circuit and check every pipe connection for boost leaks before driving.
• 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

• BIG-250-SS — do88 BigPack: Intercooler + Pipes
• BIG-250-WC — do88 BigPack: Intercooler + Radiators
• BIG-250-WC-SS — do88 BigPack: Intercooler + Pipes + Radiators

VEHICLE APPLICATIONS