Performance modifications are rarely about a single component.

As power increases, the factory intake, charge-air system, exhaust, and supporting hardware can all become increasingly important. A well-developed build therefore requires components that work with the engine's specific architecture and power goals.

ARM Motorsports has built its product lineup around exactly this approach, offering performance hardware for some of the most popular turbocharged BMW platforms, along with applications for Volkswagen, Audi, Mercedes-AMG, and other performance vehicles.

At Extreme Power House, the ARM Motorsports catalog includes intakes, intercoolers, charge pipes, turbo inlet components, downpipes, midpipes, exhaust systems, intake manifolds, and supporting hardware covering everything from BMW's N54 and N55 to the modern B58, S55, S58, and N63 engine families.

Performance Hardware Built Around the Engine

ARM Motorsports' lineup is particularly useful for enthusiasts who prefer to develop their vehicles in stages.

A BMW may begin with an intake and tune, followed by an upgraded intercooler or charge pipe. As the power target increases, downpipes, midpipes, exhaust components, and additional airflow hardware can be added.

The exact combination depends on the engine, chassis, turbocharger configuration, fuel, calibration, and intended use.

ARM's catalog covers these different stages with platform-specific components rather than relying on a one-size-fits-all approach.

BMW N54 Performance Upgrades

The BMW N54 remains one of the most heavily supported engines in the aftermarket, and ARM Motorsports has developed a substantial range of hardware around it.

Current XPH listings include:

• N54 dual-cone intakes
• N54 relocated turbo inlets
• N54 turbo outlets
• N54 inlet adapters
• N54 intercoolers
• N54 midpipes
• N54 downpipes
• N54 intake manifold
• Supporting hose and piping upgrades

The ARM N54 Dual Cone Intake replaces the factory intake arrangement with two dedicated high-flow filters, allowing each turbocharger to draw air through its own filter and intake path.

For more extensively modified N54 builds, ARM's relocated turbo inlets are designed to increase airflow to the turbochargers and are available with different inlet-size configurations and optional turbo outlets.

This makes the N54 lineup suitable for both relatively simple intake upgrades and more comprehensive turbocharger-focused builds.

N55 Intake and Charge-Air Hardware

The N55 brought a different turbocharging architecture and therefore requires different supporting hardware.

ARM currently offers N55 intake systems for several BMW chassis, including E-Series and F-Series applications, along with charge pipes, intake manifolds, turbo outlet components, downpipes, and exhaust systems.

The XPH catalog includes an N55 intake for F3X 335i, 435i, 235i, and M2 applications, as well as an N55 intake manifold and various charge-pipe solutions.

For E-Series N55 vehicles, ARM also offers a dedicated charge pipe covering applications such as the E90/E92 335i and E82 135i.

Because BMW used the N55 across several generations and chassis, owners should verify the exact vehicle application rather than assuming every N55 component is interchangeable.

BMW B58: Intake Airflow for the Modern BMW Platform

The B58 has become one of BMW's most popular modern turbocharged engines, and ARM Motorsports offers dedicated hardware for several G-Series applications.

One of the current XPH products is the ARM Motorsports G20 B58 4" Intake, designed for:

• 2021–2025 BMW G42 M240i
• 2021–2025 BMW G42 M240i xDrive
• 2019–2024 BMW G20 M340i
• 2019–2024 BMW G20 M340i xDrive
• 2020–2024 BMW G21 M340i xDrive
• 2021–2025 BMW G22 M440i
• 2021–2025 BMW G22 M440i xDrive
• 2021–2025 BMW G23 M440i
• 2021–2025 BMW G23 M440i xDrive
• 2021–2025 BMW G26 M440i Gran Coupe
• 2021–2025 BMW G26 M440i Gran Coupe xDrive

The system uses a 4-inch intake path, T6061 aluminum, reinforced silicone, a powder-coated aluminum heat shield, and a dedicated air filter.

Beyond airflow, the larger intake is designed to make turbocharger and induction sounds substantially more noticeable compared with the factory airbox.

ARM also offers a B58 charge pipe for supported 240i, 340i, 440i, 540i, 640i, and 740i applications, providing another supporting component for B58 builds.

S55: Intake, Midpipe and Exhaust Upgrades

BMW's S55 is another major ARM Motorsports platform.

For F8X M cars, the lineup includes:

• S55 intake systems
• S55 replacement filters
• S55 charge pipes
• S55 J-pipe
• S55 3.5-inch resonated midpipe
• S55 Track Exhaust
• S55 Race Exhaust
• S55 downpipe options

The ARM S55 3.5-inch resonated midpipe is designed around improved exhaust flow and sound, with a 304 stainless-steel construction. XPH lists it as compatible with OEM and aftermarket mufflers, depending on the configuration.

For enthusiasts pursuing a more aggressive exhaust configuration, the ARM S55 Track Exhaust is available for the F80 M3, F82 M4, and F83 M4, all using the S55 3.0L engine.

The Track Exhaust uses a direct bolt-on design and does not require cutting or trimming of the OEM exhaust system. ARM specifies that the system is designed to work with its own midpipe, with other 3.5-inch midpipes potentially requiring modification.

S58: Modern M3, M4 and M2 Performance

ARM's catalog also extends to BMW's newer S58 engine.

Current XPH products include:

• S58 intake
• S58 replacement filters
• S58 crossover pipe
• S58 midpipes
• S58 4.5-inch midpipe
• S58 catted downpipes
• G80/G82 exhaust tips

The ARM S58 intake is designed for the G80 M3, G82/G83 M4, and G87 M2, giving owners a dedicated intake option for BMW's current-generation high-performance inline-six.

ARM also offers S58 exhaust components, including a 4.5-inch midpipe for the G80 M3 and G82/G83 M4, as well as catted downpipe configurations.

These components allow the S58 platform to be developed progressively, from intake airflow to exhaust flow.

S58 Midpipes and Exhaust Flow

The midpipe is an important part of the exhaust system because it sits between the downpipes and rear exhaust components.

ARM's S58 midpipe range gives G8X owners multiple configurations depending on their intended exhaust setup.

For the G80 M3 and G82/G83 M4, the current catalog includes both standard S58 midpipe configurations and the larger 4.5-inch S58 midpipe.

As with any exhaust component, compatibility should be verified against the rest of the vehicle's exhaust system before ordering.

N63: Performance Hardware for BMW's Twin-Turbo V8

ARM Motorsports also supports BMW's N63/N63TU V8 applications.

Current XPH products include:

• N63/N63TU intakes
• N63/N63TU charge pipes
• N63/N63TU downpipes
• N63/N63TU midpipes
• N63R intake systems
• N63TU3 intake systems

The catalog includes dedicated applications for vehicles such as the F10 550i, F01 750i, F06/F12/F13 650i, G30 M550i, G11/G12 750i, and M850i depending on the specific component and engine generation.

This is particularly important with the N63 family because BMW has used several generations of the engine across numerous chassis.

N63 Midpipes

ARM's N63/N63TU midpipes provide a more direct exhaust-flow configuration by replacing the factory front and rear midpipe sections.

The current XPH listing specifies a full 3-inch design, deletion of the middle resonators and center muffler, and retention of the OEM exhaust valves.

The listed fitment includes:

• F10 550i
• F10 550i xDrive
• F01 750i
• F01 750i xDrive
• F06 650i
• F06 650i xDrive
• F12 650i
• F12 650i xDrive
• F13 650i
• F13 650i xDrive

All listed applications use the N63/TU 4.4L engine.

Intercoolers: Managing Charge-Air Temperatures

More boost creates more heat.

When compressed intake air becomes excessively hot, the engine management system can respond by reducing boost, ignition timing, or other parameters to protect the engine.

That makes intercooling an important part of many turbocharged performance builds.

ARM offers front-mount intercoolers and cooling upgrades for numerous BMW applications, as well as Volkswagen and Audi platforms.

For example, the ARM F25/F26 X3/X4 intercooler is a direct-fit front-mount solution for the BMW X3 xDrive28i and xDrive35i, using different engine applications including the N20 and N55. ARM describes the intercooler as having a 120% larger front area and 94% greater efficiency than the OEM unit.

This illustrates why intercooler selection should be based on the exact engine and chassis rather than simply the vehicle model.

Downpipes and Exhaust Flow

Downpipes are another major component throughout the ARM lineup.

The brand offers downpipe solutions for multiple BMW engines, including:

• N54
• N55
• N63/N63TU
• S55
• S58

The catalog also includes catted and catless configurations depending on the application.

A downpipe upgrade can substantially change exhaust flow and turbocharger behavior, but the correct product depends on the vehicle's exact engine, turbocharger configuration, emissions equipment, and intended use.

Products designated for off-road or racing use should not be assumed to be legal for public-road use.

Exhaust Systems for BMW

ARM Motorsports offers complete and partial exhaust solutions across several BMW generations.

Current XPH listings include:

• E82 135i Race Exhaust
• F8X M3/M4 S55 Track Exhaust
• F8X M3/M4 S55 Race Exhaust
• M240i Dual Exit Race Exhaust
• N63/N63TU midpipes
• M850i midpipes
• S55 midpipes
• S58 midpipes

The E82 135i Race Exhaust, for example, is available for both N54 and N55-powered E81/E82 135i applications. Its design includes front and rear midpipe sections and an axle-back section, with 304 stainless-steel construction.

ARM also provides multiple tip configurations on certain exhaust systems, allowing owners to alter the final appearance as well as the sound characteristics.

Beyond BMW

BMW may be the core of ARM Motorsports' catalog, but the brand also supports other turbocharged performance platforms.

Current XPH listings include ARM components for:

• Volkswagen MK6 Golf/GTI
• Volkswagen MK7/MK8 GTI
• Volkswagen MK7/MK8 Golf R
• Audi B9 S4/S5 3.0T
• Audi C8 RS6/RS7
• Mercedes-AMG GT
• Other applications

The ARM catalog therefore extends its focus on intakes, intercooling, exhaust flow, and supporting hardware beyond BMW.

Choosing the Right ARM Component

ARM Motorsports covers a large number of engines and chassis, so exact fitment is critical.

Before ordering, verify:

• Engine: N54, N55, B58, S55, S58, N63, or another supported configuration.
• Chassis: BMW's engine families span numerous chassis with different intake, charge-air, and exhaust layouts.
• Model year: Facelifts and production changes can affect compatibility.
• Drivetrain: Some components differ between RWD and xDrive applications.
• Existing modifications: Other brands' exhaust, intake, intercooler, or piping components may affect compatibility.
• Emissions configuration: Catted and catless components are not interchangeable in terms of emissions compliance or intended use.
• Exhaust configuration: Midpipes and rear sections may be designed around specific connection points.

This is especially important when combining multiple ARM components. For example, ARM specifically notes that its S55 Track Exhaust is designed around its own midpipe connection, while other 3.5-inch midpipes may require modification.

Building an ARM Motorsports Setup

The advantage of ARM's catalog is that a build does not have to happen all at once.

A B58 owner may begin with the 4-inch intake, then add a charge pipe and intercooler as power increases.

An S55 owner may start with an intake before moving to a resonated midpipe, downpipes, and a complete Track or Race Exhaust.

An N54 owner can progress from a dual-cone intake to relocated turbo inlets, turbo outlets, intercooling, and exhaust upgrades.

An N63 owner can approach the platform through intake, charge-pipe, downpipe, and midpipe upgrades.

The correct path depends on the engine and power target, but ARM provides components for multiple stages of the process.

ARM Motorsports at XPH

ARM Motorsports has developed a broad range of performance hardware around some of the most popular turbocharged BMW engines.

From the N54 and N55 to the B58, S55, S58, and N63, the catalog includes the airflow, cooling, charge-air, and exhaust components enthusiasts need to build progressively.

At XPH, you can shop ARM Motorsports intakes, intercoolers, charge pipes, turbo inlets, downpipes, midpipes, exhaust systems, intake manifolds, and supporting performance hardware for BMW and other supported platforms.

Whether you're upgrading an older N54 335i, developing an F8X M3/M4, building a G8X M2/M3/M4, or extracting more performance from a B58 or N63-powered BMW, ARM Motorsports offers platform-specific hardware designed around the requirements of each application.

Shop ARM Motorsports at XPH: https://x-ph.com/arm-motorsports/