In the M40i, the intake system’s proximity to the exhaust manifold poses a challenge, rapidly heating the engine bay. Elevated temperatures compromise engine performance, necessitating a solution that ensures minimal intake air temperatures (IATs). Our solution comprises of a fully sealed intake system, designed to counteract heat soak and prevent the turbo from drawing in heated air.

Moreover, our sealed airbox features a heat shield lined with gold reflective, effectively minimising radiative heat transfer from the exhaust manifold. To optimise airflow volume, we’ve maximised the airbox size, incorporating a recess to accommodate the strut brace seamlessly.

Replacing the stock convoluted intake tube, our design employs a prepreg carbon tube, boasting a much larger internal volume with an internal diameter of 109mm (4.3″) that seamlessly tapers down to match the turbo inlet, ensuring an uninterrupted airflow path. Complementing this design is a custom-made high-flow dry filter, rigorously tested for ISO-certified filtration performance and boasting a larger filtration area compared to the stock filter.

Crafted from Prepreg Carbon Fibre, the airbox effectively seals the filter against engine bay heat. Since the airbox is positioned next to the exhaust manifold it is crucial for the filter to be fully sealed so we designed the airbox to encapsulate the filter and at the same time provide a large internal volume. To seal the intake tube we have designed a laser cut plate with a rubber sealing strip which secures to the airbox. The intake tube passes through the plate and the rubber seal ensures heated air does not enter the airbox. To further minimise heat soak, there is an additional heat shield with a gold reflective layer on the exhaust manifold side which effectively combats the radiant heat transfer.

The stock inlet tube has a flexible and convoluted section to provide movement with the engine. This however also adds the possibility of turbulence in the flow path as there are multiple faces which can cause eddies. We replace this with our carbon tube which is smooth and also has a larger internal volume. Unlike most aftermarket intakes we maximised the size of our intake tube, the OEM inlet tube has an internal diameter of 80.8mm or 3.2” at the filter end. Our tube an internal diameter of 109mm or 4.3”. This equates to a massive 82% increase in cross sectional area over stock. The tube smoothly tapers down to the stock turbo inlet to ensure airflow remains as laminar as possible. The tube also has CNC machined fitting for the temperature sensor and the breather adapter.

Our cone filter is made from a non-woven mesh material which is double layered and is ISO tested to ensure that filtration is in line with OEM standards. The filter is cleanable and very stable at high temperatures with the base material being Urethane. The filter incorporates and internal flow guiding cone to help aid the airflow to converge while reducing the possibility of a stagnation point in the middle of the filter space. The filter medium has a significantly larger surface volume than the stock panel filter.

BMW X3 M40i (G01) B58D (2020-ONWARDS)
BMW X4 M40i (G02) B58D (2019-ONWARDS)

Carbon Fibre Airbox
Bespoke High Flow Dry Cone Filter
Carbon Fibre Inlet Tube
CNC Machined Temperature Sensor Mount
CNC Machined Breather adapter
CNC Machined Turbo Flange
Heat Shield with Gold Reflective Backing
Laser Cut Stainless Steel Brackets
Silicon Coupler with OEM Specification Clamps

Autobeam | Autoprint | Auto Finesse

Orders placed before 1pm 
Processed & shipped the same day unless otherwise stated.

Orders placed after 1pm
Processed & shipped the next working day.

Orders placed after 1pm on a Friday.
Processed & shipped the following Monday.

Orders are shipped Monday-Friday only.

All other brands

In stock items normally delivered within 1-3 days. Items made to order can be upto several weeks.

Stock for all other brands are not monitored therefor may be out of stock.