The aFe MagnumFORCE Stage-2 Pro DRY S (part 51-12912-B) is a cold-air induction kit built for the B58 3.0-liter turbocharged inline-six in the F30 BMW 340i. It pairs a CAD-designed, roto-molded intake tube with a 7-inch conical filter that uses oil-free, three-layer synthetic media. The manufacturer rates the airflow at 400 CFM at 7 inches of water and claims gains of up to 9 HP and 10 lb-ft of torque over the factory intake. A vacuum-formed black cover with an auxiliary air inlet keeps the engine bay looking stock while the tube reroutes intake air away from the factory box.
For a turbocharged B58 owner searching for a stage-2 intake that avoids oiled filters, the Pro DRY S is a practical choice over a generic drop-in filter. Because the filter is oil-free, there is no oil-cleaning routine to manage between service intervals. The kit also replaces the factory tube without any cutting or drilling of factory parts. Before ordering, verify your exact model year and body style: the manufacturer's listing names the 340i (F30) with the B58 engine and excludes convertibles because of the factory strut brace, but year coverage is presented differently across sources.
The kit is designed as a direct bolt-on upgrade. The manufacturer includes all clamps, coupling, and hardware, along with installation instructions and a urethane plug for the auxiliary air inlet if you prefer to block it. Searchers looking for a 340i B58 cold air intake, an F30 340i stage-2 intake kit, an oil-free BMW B58 filter, or an aFe 51-12912-B install will find that the kit's no-cut design and included hardware make it a realistic weekend project for a DIY owner.
The manufacturer states that this intake will not fit convertible models because of the factory strut brace.
The manufacturer describes the Pro DRY S as an oil-free, three-layer synthetic media filter, so it is designed to run without oil.
Yes. The manufacturer includes a urethane plug for blocking the auxiliary air inlet if you choose not to use it.
The manufacturer's listing names the BMW 340i (F30) with the B58 engine, but year ranges appear differently across sources. Confirm your exact model year and body style with the manufacturer before ordering.
The manufacturer describes this as a direct bolt-on kit that requires no cutting or drilling of factory parts, with all clamps, coupling, and hardware included. Installation instructions are provided with the kit, so follow them step by step, confirm every clamp is tight after installation, and verify that the mass airflow sensor and factory intake connections are seated correctly before starting the engine. Keep the urethane plug on hand if you decide to block the auxiliary air inlet.
