do88 BMW B58 Gen 2 (M240I/M340I/M440I/Supra) Intake System

Filtration, airflow, and heat are the key considerations when designing a new intake system for a turbocharged engine. A genuine design challenge for the B58 Gen 2 is location, the intake sits right next to the exhaust manifold, which rapidly heat soaks this position in the engine bay. High air intake temperatures are genuinely bad for engine performance, since the turbo has to build boost using hot, less dense air, making a fully sealed intake system the only way to keep IATs to a minimum. But a fully sealed system creates its own problem, a restriction from relying on only the single stock air feed at the bottom of the factory air filter box.

do88 identified during development that the system needed a secondary air feed to remove this restriction, and the sealed airbox includes a heat shield to minimise radiative heat transfer from the exhaust manifold. The stock intake hose is replaced with a smoother, larger carbon tube, starting at 105mm (4.1in) and tapering seamlessly to fit the turbo inlet, paired with a large custom-designed air filter using densely knitted cotton gauze for genuinely superior filtration, washable and reusable for long service life. Unlike the factory design, this system omits the OE's noise-reducing elements, allowing a more audible turbo spool and induction sound. Independent flow bench testing showed the intake system alone increases airflow by 15%, climbing to up to 24% when combined with the optional do88 turbo inlet.

Please select your version at checkout: without a do88 turbo inlet (compatible with the OE turbo inlet), with do88's CNC-machined turbo inlet for the OE turbo, or with do88's turbo inlet specifically matched to the Pure 800 hybrid turbo.

Why Choose This Intake System

• Fully sealed design with a secondary air feed, solving the restriction problem most sealed intakes create
• Heat shield minimises radiative heat transfer from the nearby exhaust manifold
• Up to 24% more airflow when combined with the optional turbo inlet
• Smooth 105mm carbon tube tapering to the turbo inlet, no sharp bends or restrictions
• Washable, reusable cotton gauze filter for long-term service life
• More audible turbo spool and induction sound versus the noise-dampened factory design
• Compatible with future modifications, including turbo upgrades
• UV and heat-resistant, high-gloss clearcoat finish

Compatibility

• BMW G42 M240i/M240iX (B58 Gen 2)
• BMW G20/G21 M340i/M340iX (B58 Gen 2)
• BMW G22/G23/G26 M440i/M440iX (B58 Gen 2)
• BMW G29 Z4 M40i (B58 Gen 2)
• Toyota GR Supra MK5 (A90/A91, B58 Gen 2)