Contact us if you have any questions about unlocking the full potential of your BMW with high-performance upgrade turbos and parts from Falcon Turbos.

Engineered Forced Induction & Exhaust Upgrades for BMW E9X Diesel (E90, E91, E92, E93)

The fifth-generation BMW 3 Series diesel platform represents the pinnacle of tunable, rear-wheel-drive torque. From the bulletproof cast-iron block M57 3.0L and the sequential twin-turbo 335d to the refined aluminium N57 straight-six and high-efficiency N47 2.0L, these engines respond aggressively to Stage 2 and Stage 3 modifications. However, extracting reliable figures past 350 to 500+ bhp requires eliminating restrictive factory exhaust gas recirculation, high backpressure from the DPF, and intake charge thermal soak.

Our curated E9X diesel catalogue focuses on the three hardware modifications essential for maximum volumetric efficiency, safe exhaust gas temperatures (EGTs), and sustained boost delivery:

• Billet Hybrid Turbochargers (M57, N47, N57): Standard variable-nozzle (VNT) turbos cannot flow sufficient exhaust volume at peak RPM without excessive shaft speeds and backpressure. Our hybrid turbochargers feature lightweight, multi-axis CNC-machined extended-tip billet compressor wheels, enlarged high-flow turbine shafts, and uprated 360-degree motorsport thrust bearings. Whether upgrading a single-turbo 330d or the sequential twin-turbo assembly on a 335d (small high-pressure + large low-pressure), these direct bolt-on units deliver increased mass air flow while utilising OEM oil feeds and water lines.

• Direct-Fit Stepped Bar-and-Plate Intercoolers: The factory E90 intercooler rapidly heat-soaks during back-to-back pulls, leading to elevated Intake Air Temperatures (IATs) and triggering the ECU/DDE to pull fuel injection quantity and ignition advance. Our competition-grade stepped intercoolers utilise a dense bar-and-plate core design with cast aluminium end tanks, offering up to an 85% increase in frontal volume. They fit cleanly behind standard and M-Sport bumpers with zero permanent chassis cutting.

• Mandrel-Bent T304 Stainless Steel Decat / DPF-Delete Downpipes: The factory Diesel Particulate Filter (DPF) and catalytic converter create a thermal bottleneck directly against the turbine exit. Fabricated from 2.5-inch, 3-inch, and 3.5-inch aircraft-grade T304 stainless steel with precision TIG welds, our downpipes slash turbine backpressure, drop operating EGTs by up to 150°C, accelerate turbo spool-up by 300–500 RPM, and provide the deep, distinct straight-six diesel exhaust note.

E9X Diesel Engine & Model Compatibility

• BMW M57 3.0L Straight-Six (2005–2008 Pre-LCI): Covers the single-turbo 325d (197 PS) and 330d (231 PS), alongside the sequential twin-turbo 335d (286 PS M57D30TÜ2). High-flow downpipes and massive 7-inch stepped FMICs are foundational for unlocking 400+ bhp on standard blocks.

• BMW N57 3.0L All-Aluminium Straight-Six (2008–2013 LCI): Covers the 325d (204 PS), 330d (245 PS N57D30O0), and European-market performance setups. Featuring modern piezo-injection architecture, these engines require our precision-flanged downpipes and hybrid turbos to exceed 420 bhp with rapid transient response.

• BMW N47 2.0L Four-Cylinder (2007–2013): Bolt-on performance parts for the 318d and 320d (143 PS / 177 PS / 184 PS). Upgraded billet hybrid turbos and decat downpipes eliminate standard low-end turbo lag, turning daily commuters into punchy track or fast-road machines.

Frequently Asked Questions

Do I need a custom ECU remap after installing a decat downpipe on an E90 diesel?

Yes. Removing the factory DPF/catalyst requires a Stage 2 ECU (DDE) calibration to disable DPF regeneration cycles, eliminate pressure sensor DTC fault codes, and fully optimise boost and fuel curves for the reduced backpressure.

Will an upgraded stepped intercooler fit both SE and M-Sport front bumpers?

Yes. Our direct-fit stepped intercoolers are designed using 3D laser-scanned front-end carriers to mount directly to factory radiator support brackets. They clear both SE and M-Sport bumper fascias, though minor trimming of the hidden plastic lower air-duct shrouds may be necessary depending on the core depth selected (e.g., 5-inch vs. 7-inch cores).

What is the difference between M57 and N57 downpipes on the E90?

The M57 and N57 downpipes are not interchangeable. The M57 utilises a different turbocharger outlet V-band diameter and angle compared to the N57, and the sensor bungs (EGT and lambda bosses) are placed at different orientations to clear the steering rack and transmission crossmember. Ensure you select the correct engine code variant using our drop-down selector.