An aftermarket intake on a turbo BMW replaces the factory airbox with open filters, and the real choice is where those filters live. A front mount intake moves them into the front bumper openings, where the air is coolest and the turbo noise is loudest. An engine bay intake keeps them under the hood in heat-shielded housings, which is quieter and keeps them away from road water. This guide explains both, which kit fits your car, and what to fit alongside it.
What an intake actually replaces
The factory intake on the S58, B58 and S55 is built to be quiet and to pass every emissions and noise test in every market. It draws air through a closed airbox with a paper filter, then through moulded ducts to the turbo inlets. That is a sensible design for a car that has to suit everyone, but it hides most of the sound the turbos make and routes the air past hot parts of the engine bay.
An aftermarket intake swaps the airbox for cone filters and smoother tubes and couplers. Less restriction and cooler air are the reasons people fit them; the sound is the reason most people notice. Under boost you hear the turbos spool and breathe in a way the factory box keeps from you.
What it does not do is change how the engine is tuned. Power figures depend on the car, the fuel and the tune, so we do not quote them. If your car is already tuned, tell your tuner you have fitted an intake.
Front mount intakes: cool air, the most sound
A front mount intake moves the filters forward into the openings in the front bumper. The air there comes straight from outside the car rather than from around the engine, so it is cooler, and the filters are as close to the incoming air as they can get.
The sound is the other half of the appeal. With the filters out in the bumper, the turbo and induction noise reaches you clearly, especially with the windows down. If you want the car to sound more aggressive without touching the exhaust, a front mount kit is the way to do it.
The trade-off is position. The filters sit low and near the front of the car, so they see road spray in heavy rain.
Front mount filters also collect more dirt and bugs than filters under the hood, so check them every oil change and clean or replace them as the filter's instructions say.
Engine bay intakes: the quieter, cleaner option
An engine bay intake keeps the filters under the hood. On our G8X engine bay intakes ($350), they sit inside black aluminium heat shield housings that separate them from the hot parts of the engine bay, and the kit comes with the intake pipes, red cone filters and all the fitting hardware.
You still get more sound than the factory airbox, but less than a front mount kit. The filters stay well away from road water, which makes it the better choice for a car that sees bad weather or is driven every day year-round. It also looks tidy when you open the hood, which matters at a car meet.
Front mount vs engine bay at a glance
| Front mount | Engine bay | |
|---|---|---|
| Where the filters sit | In the front bumper openings | Under the hood, in heat shield housings |
| Air temperature | Coolest, straight from outside | Cooler than factory, shielded from engine heat |
| Sound | Loudest turbo and induction noise | Louder than factory, less than front mount |
| Water and dirt | Low and exposed; avoid deep water, check filters often | Well protected |
| Looks | Filters visible through the bumper | Clean, finished engine bay |
| Best for | Fair-weather cars, maximum sound | Daily drivers, all-weather use |
Which intake fits your car
| Car | Engine | Intake options |
|---|---|---|
| G80 M3, G82 M4, G83 M4 Convertible | S58 | G8X front mount intakes ($430), G8X engine bay intakes ($350), or the G8X option on the JCX front mount intakes |
| G87 M2 | S58 | G8X front mount intakes ($430) |
| F97 X3M, F98 X4M | S58 | X3M/X4M front mount intakes ($485), or the X3M/X4M option on the JCX front mount intakes |
| G20 / G22 / G30 with the B58 | B58 | The G2X/G30 option on the JCX front mount intakes (from $315) |
| F80 M3, F82 M4, F87 M2 Competition | S55 | The S55 aluminium intakes option on the JCX front mount intakes, or the full S55 bolt-on kit |
The G8X front mount kit has black housings, black silicone intake tubes and couplers, and red cone filters. The X3M/X4M kit is the same idea with blue filters. The JCX front mount intakes are one listing with a choice of car, so pick your platform on the product page.
The F87 M2 Competition and CS use the S55; the earlier F87 M2 used the N55, which none of these kits fit. If you are not sure which engine your car has, the chassis codes guide shows how to check, or send us your VIN.
What to pair an intake with
An intake on its own is a sound and response upgrade. Most owners fit it as the first step in a set of bolt-ons, in roughly this order.
Charge pipes. These carry the boosted air from the turbo to the throttle body, and on the B58 and S55 the factory plastic pipes are a known weak point once boost goes up. Our B58 charge pipe ($190) comes in Gen 1 and Gen 2 versions, and the F80/F82/F87 charge pipes with J-pipe ($380) cover the S55. The charge pipe guide explains why they fail and how to tell the B58 generations apart.
Downpipes. This is the step that needs a tune, and the one that changes the car most. The downpipe guide covers the options, the tune and the legal side.
Intake manifold. On the B58 the CNC intake manifold ($1,150) replaces the manifold on the engine itself, after the turbo and charge pipe. Despite the name it is a different part from the air intake, and it is a later step for a car that is already built.
Everything at once on the S55. The JCX S55 bolt-on kit ($2,500) puts the whole set in one box for the F80 M3, F82 M4 and F87 M2: front mount intakes, charge pipes with J-pipe, charge cooler, catless downpipes and an equal length midpipe, with a resonated option. The downpipes are sold for off-road and competition use only and need a tune.
Installing an intake
Intakes are among the easiest engine parts to fit at home with basic hand tools. The general order is the same on every car:
- Work on a cold engine and photograph the factory routing before you take anything apart.
- Disconnect the battery if the kit's instructions say so, and unplug any sensors on the factory intake before you remove it.
- Remove the factory airbox and ducts. On a front mount kit the new tubes route forward to the filters in the bumper openings; on an engine bay kit the heat shield housings go in where the airbox was. Follow the kit's routing exactly.
- Fit the new tubes, couplers and filters loosely first, then tighten every clamp once everything lines up without strain.
- Reconnect the sensors, start the car, and listen at idle for any hiss or whistle from a joint.
Check every clamp again after the first few drives, as silicone couplers settle as they heat up and cool down. If anything looks different from the kit's instructions, stop and ask us before you start cutting or forcing parts.
Not sure which kit fits your car, or whether your bumper has the openings a front mount kit needs? Send us your car's year and model, and a photo of the front bumper, through the contact page and we will confirm it before you order.
FAQ
Is a front mount intake better than an engine bay intake?
Neither is better for every car. A front mount intake gets the coolest air and the most sound, but its filters sit low in the bumper. An engine bay intake is quieter and better protected from water. Pick front mount for a fair-weather car and engine bay for a daily driver.
Do I need a tune for an aftermarket intake?
Intakes are commonly fitted to a car on its factory tune. A tune lets the car make full use of the extra airflow, and if your car is already tuned, tell your tuner about the intake. Downpipes are the part that needs a tune.
Can I drive in the rain with a front mount intake?
Yes, normal rain is fine. Avoid deep standing water and flooded roads, because the filters sit low in the front bumper and an engine that pulls water in through its intake can be badly damaged.
Will an intake make my BMW louder?
Yes. You will hear the turbos and induction much more clearly under boost, most of all with a front mount kit. The exhaust note itself does not change; that comes from the midpipe and exhaust.
Which intake fits the G87 M2?
The G8X front mount intakes are listed for the G87 M2 as well as the G80 M3 and G82 M4, because all three share the S58 engine. The G8X engine bay intakes are listed for the G80, G82 and G83 only.
