The B46 and B48 are closely related two litre turbocharged fours, and they sit under the bonnet of a very large number of cars. The G20 320i and 330i, the G22 420i and 430i, and the G42 230i all use one of them, and the F3x cars that came before them used the same engine family.
Because the engine is so widely fitted, owners tend to look for parts that transfer between models. Some do, and some do not, and the difference is almost always in the space around the engine rather than in the engine itself.
This article covers the front-mount intake on these cars and the fitment questions that come with it.
A two litre four in a modern bay sits behind a large cooling pack, and the air around it gets warm quickly in traffic. A front-mount intake moves the filter forward, into the airflow in front of the radiator, and pulls from there.
The cold air intake for the BMW 320i, 330i, 420i, 430i and 230i 2.0 litre engine is built around that position, with a tube run that reaches the front of the car without adding a stack of couplers to get there.
Fewer joints is the aim. On a small turbo engine a leak in the intake path is felt as a loss of response far more than as an obvious fault, so the simplest possible path is worth the effort of routing it properly.
The airflow meter is the part of an intake that is easiest to get wrong. It sits in a specific position relative to the tube, and moving it changes what the engine management sees.
A tube that positions the sensor badly will cause rough running, and the cause is not always obvious because the car may start and idle perfectly well.
That is why a designed intake keeps the sensor boss in the position the calibration expects. It is one of the details that separates a part made to fit from a part made to look right.
Heat soak is the reason an intake can feel strong on a cold morning and flat after twenty minutes in traffic. The air around the engine bay gets warm, and an intake drawing from there inherits that warmth.
A front-mount position reduces the problem, and keeping the tube away from the exhaust side reduces it further. This is a layout question more than a materials question.
Where a part does have to sit near heat, titanium is the sensible choice because it keeps its strength and sheds heat rather than storing it.
Owners who drive mostly in traffic notice the effect more than anyone, because the bay soaks heat while the car is moving slowly and then holds it. A front-mount filter draws from ahead of the radiator, where the air has not been through the cooling pack yet, and that is the main reason the layout is chosen on this engine family. The gain is not dramatic in isolation, but it is consistent, and consistency is what a driver feels over a long journey rather than in a single pull on a cold morning. It also keeps the intake clear of the plastic covers and trim that sit over the hot side of a modern bay, which simplifies fitting and leaves fewer parts to remove and refit.
A front-mount intake has more length and therefore more places to connect. Each connection has to absorb movement between the rigid tube and the engine, and each one has to stay sealed under boost.
Silicone with proper reinforcement is what does that work. Performance silicone hose for custom applications is produced for the positions where the shape has to be specified rather than picked from a list.
Titanium fab components and silicone are produced together for exactly this reason: the rigid parts and the flexible parts only work as a system.
The front of a G-series car is busy. There are headlight housings, wiring looms, a bumper beam and a cooling pack, and the intake tube has to thread between them without touching any of it.
Clearance that looks sufficient on a bench can close up when the engine moves under load. The check has to be done with everything fitted and the car in use.
Because so many models share this engine, the differences are worth confirming rather than assuming: the F3x cars and the G-series cars have different front ends even though the engine is the same.
Every project here starts with a negotiation and then the work begins. The useful beginning is a drawing or a sample, and a clear statement of what the car is.
The samples are measured and tested by an engineer and sent to the customer, and mass production starts only after that confirmation. It is a slower start and a much shorter finish.
Tigindustry was founded in 2009, and the plant covers roughly 53,819 sq ft with more than 50 employees. Customers are mainly in America, Canada, Australia, Britain, Germany, France and Italy, and the intake work on these engine families is a regular part of the range.
You can browse the models on our shop by vehicle page and the wider range on the BMW, Audi and Porsche page. The parts sit under air intakes, performance silicone hose and exhaust pipe.
Send the chassis code, the section you want to change and either a drawing or a sample, and the answer will be about fitment rather than about badges.
