2013-2015 Mercedes GLK250 2.1L BlueTec ECU Performance Tune | Tunezilla

Most NAT Performance exhaust systems are built to order. Standard orders typically ship within 10 business days. Rush orders are prioritized and typically ship the next business day. Once your order ships, you will automatically receive a tracking email.

There are two timelines involved.

Production time:

Most exhaust systems ship within 10 business days.

Transit time:

Once shipped, delivery typically takes:

• 3–5 business days within the United States (standard shipping)

• 1–2 business days with rush/express shipping depending on your location

Tracking information is emailed automatically once your order ships.

Most NAT Performance exhaust systems are built in production batches. Your order may still be in the current production queue and will ship within the standard 10 business day timeframe. Tracking will be emailed automatically once your order ships.

Most NAT Performance exhaust systems are built to order rather than stocked on shelves. This helps maintain consistent quality and ensures proper fitment. Standard orders typically ship within 10 business days, while rush options may ship sooner.

Tracking is automatically emailed when your shipping label is created. If you haven't received tracking yet, your order is likely still in the production queue.

Yes. Some tuning hardware ships directly from the tuning provider, while exhaust systems ship from NAT Performance. Because of this, your tuning device and exhaust parts may arrive separately.

If you have miss spelled or auto filled in a incorrect address, simply reply to your order conformation email and confirm. Once you double check if the address given is wrong kindly notify us via email. If the given address is wrong we can change the address to the correct one within 24 hours.

At Nat Performance Ltd., we take pride in the quality and performance of our products and services. Due to the nature of our offerings, we maintain a No Refund Policy. All sales made through our website or other channels are final.

We understand that exceptional circumstances may occur, and we are committed to ensuring the satisfaction of our customers. If you find yourself in a situation where you are not completely satisfied with your purchase or if you encounter any issues, we encourage you to reach out to us directly for support.

You are able to cancel your order with no penalty! You must cancel your order before it ships.

Yes. Most delete setups require tuning to prevent engine fault codes and ensure proper engine operation. NAT Performance offers several tuning options depending on the vehicle platform.

TuneZilla tuning uses a FlashZilla device.

Process:

1. The FlashZilla device ships directly from TuneZilla.

2. A tune credit is delivered by email after purchase.

3. When the device arrives, scan the QR code included with the FlashZilla for setup instructions.

4. Connect the FlashZilla to your vehicle and computer to read the ECU file.

5. Upload the file and redeem your TuneZilla credit to receive your tune.

This tuning method requires a Windows laptop.

Stevenson tuning uses a Powergate device.

Process:

1. The Powergate device ships directly from Stevenson Tuning.

2. Download the Powergate app once your device arrives.

3. Connect the device to your vehicle and follow the instructions in the app.

4. The app will guide you through reading and flashing your ECU.

This tuning method works with Apple or Android mobile devices.

After placing your order, tuning instructions are delivered by email.

Process:

1. Follow the instructions provided in the email.

2. The tune includes an OBD interface cable.

3. Connect the cable between your vehicle and a Windows laptop.

4. Read your ECU file and submit it as instructed.

5. DUDMD will provide your custom tune file.

This tuning method requires a Windows laptop.

NAT Performance occasionally offers promotional discounts. Follow our social media pages to see if we are currently offering a promotion.

Each product page lists the compatible vehicle years and models. If you are unsure about compatibility, contact us with your vehicle year, make, model, and engine and we can help confirm fitment.

NAT Performance does not provide technical support via voice calls. All technical support must be handled through email or text message. This ensures we can review details, provide accurate information, and keep a record of the conversation.

If your question isn’t answered here, feel free to contact us. You can reach NAT Performance through the website contact form, email, or text message.