The S55 turbo engine that powers the BMW M2C / M3 / M4 F8X has two air filter boxes that feeds the turbos with fresh air. The OE air filter boxes has panel filters that are quite small and therefore quite restrictive for the air flow.

DO88’sgoal when designingtheir new intake system was that it must be enclosed, so it does not draw hot air from the engine bay, which many aftermarket intake systems do. If the intake system draws hot air from the engine bay it is directly equatedto warmer charge air (higher IAT). During all testDO88carried out during the development oftheir entire BMW F8X M2C/M3/M4 product range,they saw clearly how the power band is directly equated with the IAT (Intake Air Temperature) and turbo inlet restriction.

When designingtheir upgraded intake system,they started with 3D scanning the engine bay onthe M3 Competition. This gavethem an exact 3D-model of the available space to design our intake system in.

DO88found thatthey could use large double cone BMC air filters with large filtering area for higher flow.DO88 also use 3 (76mm) tubing designed with as few bends as possible to reduce the air flow restriction. To eliminate hot air from being drawn into the air filtersDO88 designed heat shields and lids that together with rubber seals making the system feed the engine with cold air.
The DO88intake system uses the OEM air inlet ducts that feed the air filters with fresh air from the grill.

All these improvements have resulted in an impressive +10 hp top power gain and in the mid-range RPM saw gains up to +20 hp.