BMW F90 M5 on the Racebox dyno
BMW F90 M5 S63 engine bay, Racebox Racemode tune
BMW S63 M Power engine with carbon intake, Racebox
BMW F90 M5 (S63) tuned by Racebox
BMW F90 M5 S63 at Racebox
chevron_left
chevron_right

BMW M5/M8/X5M/X6M F90/F91/F92/F93/F95/F96 S63TU Tune

$850.00 USD
$850.00 USD
Shipping calculated at checkout

Racebox S63 Custom Tuning — BMW M5, M8, X5M & X6M

Every S63 Racemode tune is a custom MHD calibration built for your exact car, mods, and fuel, flashed from home with the MHD app and a WiFi adapter. On our Dynojet, a stock-turbo S63 makes around 680 whp / 680 wtq on 93 octane and 750 whp / 750 wtq on E30 flex fuel. You get a 1–2 business day response and 30 days of tune revisions from your first datalog, with OEM safety limiters retained.

S63 Power (whp, Racebox Dynojet)

Setup Fuel Power (whp)
Custom tune, stock turbos 93 ~680
Custom tune, stock turbos E30 ~750
Upgraded turbos E-fuel Custom targets — contact us

Every dyno chart we publish lists the ambient conditions and correction factor. Real numbers, no fluff.

Which tune should I pick?

  • Custom Stock Turbo Gasoline — 93 octane on stock turbos (~680 whp).
  • Custom Stock Turbo Flex Fuel (requires flex fuel kit) — E30 blend on the stock fuel system (~750 whp). E85 / higher ethanol needs HPFP/LPFP upgrades.
  • Custom Upgraded Turbo — for upgraded turbochargers and supporting mods; fully custom targets, logged and revised to your build.

Tuned entirely on MHD. Reach out and we'll map a plan for your S63.

More BMW tuning from Racebox

One Stop Shop Get it all in one place
The BEST Service 24-48 hour responses
The FASTEST Cars Many platform records

The Racemode Advantage

The Racemode Advantage: An Overview

Tailored Performance Calibration for the BMW S63: Racebox builds custom performance calibrations designed specifically for your F90 M5, F9x M8, or X5M/X6M, taking into account your unique modification list and preferred fueling, including 93 octane and E30 flex fuel. Our meticulous engine tuning delivers maximum performance while maintaining OEM-level drivability and reliability.

Benefits of Racemode Tuning

  • Enhanced Throttle Responsiveness and Drivability: Leveraging our experience across hundreds of BMW tunes, we've developed a calibration that sharpens throttle response and reduces the lag inherent in stock ECU mappings.
  • Rigorously Tested: Our tuning strategies have been honed over years of dyno testing and real-world driving, so our calibrations hold up to the conditions our customers actually face.
  • Precision Ignition Timing for High Octane Fuel: By optimizing timing for high-quality fuel, we extract maximum power safely and efficiently.
  • OEM Safety Limiters Retained: We maintain and enhance OEM fail-safes within the ECU calibration, closely monitoring operating parameters to protect your drivetrain against the increased power output.

Additional Features

  • Speed Limiter Removal: The ECU's vehicle speed limiter is deactivated, allowing for higher top speeds.
  • Improved Fuel Efficiency: Our calibrations optimize fueling, potentially improving efficiency with aftermarket intake and exhaust systems. Note: increased throttle use may offset these gains.

Tune at Home with MHD

Convenience at Your Fingertips: With the MHD Flasher app and a WiFi adapter, you can flash your S63 right from your smartphone at home. We provide comprehensive instructions and data-logging support for our custom tuning, so the majority of our remotely tuned customers get full Racemode performance without ever visiting a shop or dyno.

Racebox is committed to performance that respects your vehicle's integrity while pushing its capabilities to new heights. Enjoy the thrill of optimized performance with the peace of mind that comes from professional, experienced tuning.

Refunds and Returns

The sale of any RACEBOX Racemode Tuning product or service is final at the moment of checkout. RACEBOX will adhere to an “all sales are final” policy unless there are circumstances that, in the sole and absolute discretion of RACEBOX, make a return or refund appropriate.

BMW F90 M5 on the Racebox dyno
BMW M5/M8/X5M/X6M F90/F91/F92/F93/F95/F96 S63TU Tune

BMW Model: F90 M5, Tune Type: Custom Stock Turbo Gasoline

BMW F90 M5 on the Racebox dyno
BMW F90 M5 S63 engine bay, Racebox Racemode tune
BMW S63 M Power engine with carbon intake, Racebox
BMW F90 M5 (S63) tuned by Racebox
BMW F90 M5 S63 at Racebox

What Makes Racebox Special

Our humble beginnings

Racebox was conceptualized when our founder Hussain Boxwala was trying to purchase a tune for his VR30 powered Q50 back in 2018. When speaking with tuners, he realized that there was a need for clear communication, honest work, and prompt response service. In an effort to create the best customer experience possible, Hussain set out to develop his first Q50 calibration on his personal vehicle.

100% Honest Marketing

Our main goal is to provide customers with the most realistic expectations for their vehicles. This means we'll never lie about the mods on our shop cars, the times they run, or the power they make. We aim to always provide the most information possible, like listing ambient conditions and correction factors on all dyno charts. We're not here to push an agenda, we're here to help you achieve your goals.

World-class Customer Support

There's nothing more frustrating than waiting weeks for a reply from your tuner, which is why we'll never take longer than 48 hours to get back to you. Often times, it's same day replies. We know you value your time, and so do we. We're reachable via phone, text, or e-mail, and we'll never leave you hanging :)

Racemode Tuning FAQ

We've curated a list of the most common questions y'all have when reaching out to us. Please see the cards to the right for some of the more frequent ones.

What is S63 Racemode Tuning?

S63 Racemode Tuning isn't just a tune, it's a transformation. Our proprietary MHD calibration unlocks the full potential of your F90 M5, F9x M8, or X5M/X6M. Expect big horsepower, massive torque, and throttle response sharp enough to feel wired to your right foot. Whether you're dominating the street or the track, this tune sets you apart.

Is S63 Racemode Tuning safe for my ride?

Safe? Absolutely. Reliable? 100%. We don’t just throw numbers at the dyno and call it a day—we fine-tune your setup to perform like a beast without sacrificing your engine’s health. Reliability and power go hand-in-hand when Racebox is behind the wheel.

Which vehicles can run S63 Racemode Tuning?

If it's got an S63 under the hood, you're good to go. That includes the BMW F90 M5, F91/F92/F93 M8, F95 X5M, and F96 X6M. We're ready to take your car to the next level.

What kind of power are we talking here?

On a stock-turbo S63, our custom tune makes roughly 680 whp / 680 wtq on 93 octane, and about 750 whp / 750 wtq on E30 flex fuel. Running upgraded turbos? Power climbs well beyond that depending on your turbos and supporting mods, reach out and we'll talk targets for your build. As always, every dyno chart we publish lists the ambient conditions and correction factor.

What do the different S63 tune options include?

Every S63 Racemode tune is a custom calibration dialed in for your exact car. Here are the options:

Custom Stock Turbo (93 Octane):

• For stock-turbo cars on premium pump gas.

• Around 680 whp / 680 wtq on a healthy setup.

• Strong daily-to-track power with OEM reliability retained.

Custom Stock Turbo (Flex Fuel):

• Adds E30 flex-fuel support (flex-fuel kit required).

• Around 750 whp / 750 wtq on E30.

• E85 / higher ethanol requires HPFP/LPFP upgrades.

Custom Upgraded Turbo:

• For cars running upgraded turbochargers and supporting mods.

• Fully custom targets, logged and revised to your build.

Which tune should I choose for my S63?

It comes down to your setup and fuel:

• Stock turbos on pump gas? Go with the Custom Stock Turbo (93 Octane) tune.

• Running a flex-fuel kit and want more? The Custom Stock Turbo (Flex Fuel) tune on E30 is the move.

• Upgraded turbos and big power goals? Pick the Custom Upgraded Turbo tune and we'll build to your targets.

Can Racemode handle ethanol blends like E30 or E85?

Absolutely. Ethanol is the secret sauce for serious power.

• E30: Requires a flex-fuel kit, no additional upgrades needed.

• E85 (E50+): Requires HPFP/LPFP upgrades along with a flex-fuel kit.

We'll optimize your S63 for ethanol blends so you can put the extra fuel to work.

Does the tune come with launch control and map switching?

Not at this time. The S63 Racemode package is a single custom calibration built for your setup and fuel. We're not offering in-tune map switching or launch control on this platform right now. If that changes, we'll update this page.

Do I have to visit the shop for Racemode Tuning?

Nope. You could be in Houston or halfway across the globe—we’ve got you covered. All you need is an MHD WiFi adapter, a smartphone, and an internet connection. We’ll walk you through the whole process like you’re here with us.

What do I need to get started with Racemode Tuning?

Here’s your checklist:

• MHD WiFi adapter.

• A solid smartphone or laptop (Windows OS for advanced options).

• A good internet connection.

• Any mods already installed before the first flash—don’t leave us guessing.

How long does the tuning process take?

On average, 6–10 business days. How fast we finish depends on how quickly you respond and send logs. Custom tuning is a team effort—don’t ghost us, and we’ll get you ripping down the road ASAP.

What if I run into issues during the process?

Problems? Not a chance—just solutions. Call us at (832) 786-9038 or hit us up on the email thread you’re already in. Attach your data logs, DTC codes, and any details, and we’ll get it sorted. You’re not alone in this.

Can I tweak the tune later?

While we don’t include lifetime updates for modifications, you can always pay for a retune if your setup changes. If the changes are minor and within the first month—like adding certain mods we already support—we’ll update it for free. Just reach out, and we’ll let you know what qualifies.

Will this void my warranty?

It depends on your dealership, and let’s face it, some are chill, and some aren’t. They’ll need to prove the tune caused an issue to void your warranty. Pro tip: we give you a stock file to flash back before you roll into the service bay. Talk to your advisor and play it smart.

How do I keep my S63 running strong after tuning?

Maintenance is everything when you’re running tuned. Stay on top of your oil changes (high-quality synthetic only), swap those spark plugs regularly, and keep an eye on fluids like coolant and transmission oil. Also, invest in upgraded cooling options—like a larger heat exchanger or auxiliary radiators—to keep temps in check when pushing serious power.

How fast do you respond?

Fast. We aim for a 24-48 hour turnaround during business days. Custom tunes often see daily revisions unless we’re slammed, in which case it’s closer to 48. Either way, you’ll never be left hanging—no ghosting, no weeks of waiting. That’s not how we roll.

What mods do I need to run Racemode Tuning?

None, technically. Racemode Tuning delivers power gains even on stock setups. But if you want to go all-in, start with upgraded downpipes, free-flowing exhaust, and an intake system. The more you bring to the table, the harder we can push.

What if I’m new to the tuning game?

First things first: get your car up to date with basic maintenance (fluids, spark plugs, filters). Once that’s dialed in, start with the essentials—downpipes, intercoolers, and exhaust upgrades. Call us if you need advice—we’ll steer you right.

What if I’m not local to Houston?

No big deal. We’ve tuned over 5,000 cars worldwide without ever meeting the drivers in person. As long as you’ve got the gear (MHD adapter, phone), we can bring Racebox-level performance to you.

You might also like

chevron_left chevron_right