TunedMercedes M157 Tune

Description

Expected Output

The M157 easily tunes to 640 HP and 663 TQ (820 nm) in a stage one very light tune calibration and achieves approximately another 20-40 HP with air intakes, another 40 HP with 400 cell metallic cats, and an additional 20-50 HP with ethanol blend fuel mix.  With m157 hybrid turbos, methanol, and hpfp you can find achieve than 1000HP in a daily driver tune.  With appropriate upgrades and supporting mods to the car a quarter mile speed in the 9.99-10.5 range should be achieved in a CLS63 4matic.

What to Expect

Expect faster throttle response and tuned mercedes experience while retaining stock-ish feel.  The end result is a car that feels like it was factory tuned for 700hp.

The car will likely be louder on downshifts and smoother on deceleration and the fans will be louder.  The car should pull very smoothly and provide an excellent experience rolling performance and 60-130 times that will rival most cars on the road.

“Really wonderful job, thanks” – Customer Feedback

What You’ll Feel Immediately

• Sharper throttle response and stronger, more immediate torque.
• Smoother, more powerful midrange acceleration with consistent pull.
• Reduced turbo lag and improved gear shift response.
• Optional exhaust burbles or sport pops available on request.

Why TunedMercedes?

• Expertly calibrated using live datalogs and real-world feedback.
• Every file undergoes AI + Human Verification before delivery.
• Free retune for hardware changes within 30 days of purchase.
• Dedicated after-sale support — we stand behind every calibration.

Typical Results

Stock Output: ~550–577 HP
Tuned Output: ~640–700 HP Stage 3 +1000 HP  (depending on fuel and supporting mods)
Torque Gain: +150–180 lb-ft

Results vary by hardware configuration, fuel quality, and maintenance condition.

Customer Feedback

“”Drives great… can hear the turbos now”
— E63 AMG Owner, Montana

“Rely wonderful job bro thnx alot”
— CLS63s Shop, Libya

Frequently Asked Questions
Is this safe for daily driving?
Yes. All calibrations retain OEM safety systems and are built for both performance and long-term reliability.

Can I return to stock?
Yes. We provide a return-to-stock file for free upon request.

What fuel is recommended?
93 octane (98 RON) or higher is recommended for best performance and consistency.

Do you offer support after purchase?
Absolutely. We’re here to help with datalogs, adjustments, and advice even after your tune is installed.

The Process

As soon as an order is placed we confirm all your details through direct communication.  Most of the time we will send you a few items in a TunedMercedes mailer.  These will connect your car to your windows laptop as long as this laptop isn’t locked in some corporate or school mode.  This process has 3 parts.

Step 1 Reading the ECU

TunedMercedes technician will remote desktop into your windows laptop while connected to the car.  They will read your current software configuration and confirm we have access to the file on the servers to perform a “virtual read”.

Step 2 Calibration

Our technicians will calibrate your file matching your modifications to your car’s exact software.  The calibrations take place in this model will take part in a special part of the ECU that is designed to be modified or calibrated.

We are telling the ECU that we expect more air and we want more power in these areas.  For example raising the top speed isn’t done by tricking the car into thinking it is going slower (this is what a piggy back tuner does in an extremely simplified example) it actually tells the computer in the programmed area to go to 200 mph or whatever is suitable for your current tire rating.

Step 3 Writing

At this point we will have our technician log back in during a scheduled session where the laptop and car are connected with supplied gear that we shipped quickly to you. In this session we will write the calibrated file back to your ECU.

In certain rare cases we may ask you to send your ECU or come in for a bench flash if there is no matching software found.

Bench Flash Method

Step 1

Remove the ECU, take pictures of it, send it to us packaged and we will read it on the bench, then calibrate it, then write the software on the bench.

Step 2

Reinstall the ECU

Add to Cart — M157 ECU Tune