The G90 & G99 M5—Why CarBahn’s Stage 1 Controller Outperforms the Competition
The BMW G90 and G99 M5 are already impressive machines—pairing electrified torque with twin-turbo V8 power. But even the most advanced M car ever made leaves room for more. A lot more.
Enter the CarBahn Stage 1 Performance Controller—the most powerful, reliable, and easy-to-install performance upgrade available for the G90/G99 platform. Developed by tuning legend Steve Dinan, this controller unleashes up to 913 HP and 969 lb-ft of torque, all without modifying your ECU or compromising your warranty.
Effortless Power, Delivered Safely
Unlike flash tunes or piggyback modules, the CarBahn Controller is a plug-and-play system that integrates seamlessly with your M5’s existing electronics. Installation takes under an hour with basic tools, and it’s fully reversible.
You get selectable maps via Bluetooth, giving you the ability to run on 91, 93, or 100 octane depending on your goals. Just fire up the CarBahn app on your phone and choose your desired power level.
No ECU flash
No check engine lights
No drivability issues
Full power, full confidence
Order the Stage 1 Controller Now
What Makes CarBahn Different?
1. Developed by Steve Dinan
With over 40 years of experience—including multiple wins at the 24 Hours of Daytona—Steve Dinan has built a tuning legacy on safety, reliability, and unmatched performance.
2. Plug-and-Play Simplicity
No permanent modifications, no downtime. Installation is DIY-friendly with downloadable instructions included.
3. Built-In Fuel Flexibility
Easily switch maps for 91, 93, or 100 octane through your smartphone via Bluetooth. Maximize power for your fuel of choice.
4. Optional Factory Matching Warranty
Add peace of mind with CarBahn's Factory Matching Warranty—up to 4 years / 50,000 miles of drivetrain coverage, honored at your BMW dealership.
“If something goes wrong, just take it to the dealer—we’ll handle the backend. It’s performance without risk.”
Your Upgrade Path Starts Here
Looking to build your G90 M5 beyond the Stage 1 Controller? CarBahn’s platform is designed for staged performance.
Bundle it with:
S63 High Flow Replacement Intake Filters
Carbon Fiber Cold Air Intake for BMW F9X/G9X M5
FAQs
Will this affect my factory warranty?
Not when paired with CarBahn’s Factory Matching Warranty. You stay covered—up to 50,000 miles.
Do I need to flash my ECU?
No. The Stage 1 Controller is completely external and reversible. It does not rewrite the ECU.
What fuel should I use?
You can select 91, 93, or 100 octane maps using the Bluetooth app. Power scales accordingly.
Can I install it myself?
Yes. Most customers complete installation in under 1 hour. Download the install guide.
Will it work with future upgrades?
Yes. The Stage 1 Controller is engineered to be compatible with all upcoming CarBahn hardware.
Ready to Awaken the M5 BMW Should Have Built?
Buy the CarBahn Stage 1 Performance Controller – $995
Add a Factory Matching Warranty
Shop Full G90 M5 Upgrade Collection
Talk to a Performance Expert