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BMW X3M / X4M UPGRADES & MODS
Explore CarBahn’s high-performance upgrades for the BMW F9X X3M and X4M. From plug-and-play Performance Controllers and ECU Software to cooling, filtration, and chassis parts, every product is built for precision, repeatable performance, and daily-driven reliability.
Fits 2019+ X3 M / X4 M and Competition models
CarBahn / F97 X3 M & F98 X4 M
Build Your Power.
Your X3 M or X4 M. Your next level of performance.
Fitment: 2019–2024 BMW F97 X3 M & F98 X4 M, including X3 M Competition & X4 M Competition.
Your Selected Upgrade
Performance over stock
Horsepower gain
Torque gain
Published product figures using 100 octane on the CarBahn San Jose Dyno. Fuel and configuration may affect results.
Complete Your Setup
Power output varies between Base and Competition models, fuel and configuration. Use the product link for model-specific dyno figures.
Configuration Total
Taxes, shipping, installation labor and any ECU unlock or flashing-platform fees are additional.
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Need a hand? Talk with our tuning team.
Your Tuning Questions, Answered.
What is the difference between a controller and an ECU reflash?
A Performance Controller is a plug-and-play module that works with the factory ECU to increase performance, without an ECU unlock. An ECU reflash changes the engine calibration directly, giving CarBahn broader control over how the engine delivers power. ECU software requires a bench unlock and a compatible installation method.
Why is the heat exchanger required?
More power puts greater demand on the charge-air cooling system. The CarBahn heat exchanger helps manage intake temperatures and maintain consistent performance. It is required for Stage 2 and included in the Stage 2 power packages shown here.
What does the Factory Matching Warranty do?
It provides separate CarBahn coverage for eligible engine and powertrain repairs under CarBahn’s warranty terms. Eligibility, duration, mileage limits and exclusions apply; purchasing a tune does not automatically include coverage. Stage 2 requires the CarBahn heat exchanger. Software installed through Bootmod3 or MHD is not eligible. Review Factory Matching Warranty details →
Can I upgrade from a controller to software?
Yes. Contact our tuning team to arrange the controller-to-software upgrade and confirm the current trade-up offer. The software installation requires an ECU bench unlock; your dealer can confirm which existing supporting hardware can be reused.
What is a bench unlock, and how much does it cost?
A bench unlock prepares your engine computer (DME) to accept tuning software using a direct connection to the ECU. A participating CarBahn dealer performs the Autotuner unlock locally at installation. The unlock fee and labor are set by the installer and are additional to the prices shown here. Ask your dealer for an installed quote. Controllers do not require an unlock.
Does this fit Competition models?
Yes. This builder covers 2019–2024 F97 X3 M and F98 X4 M, including X3 M Competition and X4 M Competition. Published power output and gains vary by model, fuel and configuration. View the product’s model-specific dyno data for your vehicle.
CARBON FIBER ENGINE CHASSIS BRACE SET — X3M / X4M
Tie the front structure together and sharpen steering feel with CarBahn’s Carbon Fiber Engine Chassis Brace Set for the BMW X3M and X4M. The brace reduces cowl and chassis flex under load, helping the front end stay planted under heavy braking, quick transitions, and high-grip tire setups.
Fits
BMW F97 X3M • F98 X4M (Incl. Competition)
Construction
Carbon fiber brace • Billet mounts
Finishes
Anodized Black & Aluminum
Benefits
Reduced flex • Sharper response
EXHAUST SYSTEM — X3M / X4M
Unlock a deeper tone and freer-flowing exhaust on your BMW X3M/X4M. CarBahn’s stainless steel system reduces backpressure, improves response, and delivers a refined, motorsport-inspired sound that still works for daily driving and long highway trips.
Stainless Steel Exhaust
$2,295
304 stainless construction, mandrel-bent tubing, and tuned mufflers for a rich, controlled tone without
drone — the ideal balance of performance and refinement for X3M/X4M owners.
Shop Stainless Exhaust
Exhaust Dual Valve Module
Take full control of your exhaust tone with adjustable valve operation — open, closed, or OEM logic. $595
AIRFLOW: FILTERS & COLD AIR INTAKE — X3M / X4M
Let the S58 breathe. Refresh your factory airboxes with high-flow replacement filters or upgrade to the carbon fiber Cold Air Intake Kit for cooler, less restrictive airflow and a motorsport look under the hood.
WHEEL SPACERS — X5M / X6M
Dial in the perfect stance with CarBahn’s precision-machined, hub-centric spacers. Designed to push your wheels outward for a more aggressive and balanced look—without compromising ride quality or safety. Available in 12 mm and 15 mm sizes.
Price Range
$115 – $125
Available Sizes
12 mm • 15 mm
CARBON FIBER REAR SPOILERS — X3M / X4M
Finish the rear profile of your X3M or X4M with CarBahn carbon fiber spoilers. Both pieces are designed for OEM-quality fitment, adding down-the-road presence and a premium motorsport look without overwhelming the factory lines.
Browse More X3M / X4M Upgrades
Core categories for your F9X—engines, cooling, and exhausts engineered by CarBahn.
Engines & Components
Heat Exchangers & Intercoolers
S58 Turbo Chargers
Explore More from CarBahn
Car Care Essentials
Keep your performance car looking as sharp as it drives.
CarBahn Warranty Coverage
Performance engineered—and protected.