No. Your tune works the same no matter how many miles are on the vehicle.

That said, it's important to make sure everything works the way it should before you tune or add aftermarket parts. Starting from a verified baseline means fewer things to rule out if a problem comes up later.

No, ZFG Racing does NOT offer any warranty for tuning services or products. Any modifications, including tuning, are performed at the user's own risk.

GPF stands for Gasoline Particulate Filter. This is a an emissions control device present on some 2026 model year Ford Explorers.

To determine whether your vehicle is equipped with a Gasoline Particulate Filter (GPF), please reference the emissions sticker under the hood (example below). If "GPF" is listed on the sticker, then there is a GPF on your vehicle.

Certain 2025+ Explorer ST vehicles may be equipped with a Gasoline Particulate Filter (GPF). While this seems to be present on *most* 2026 models, we have seen some 2026 Explorers that are NOT GPF-equipped.
To determine whether your vehicle has a GPF, please review the emissions sticker located under the hood. If "GPF" is listed on the emissions label, certain exhaust components or systems may not be compatible with your vehicle. Please see the photo below for reference.

Generally, no.
Once a Tune Request has been submitted, the fuel type of your tune cannot be changed.
However, you can purchase an Additional Tune to cover a different fuel type.

The ideal fuel type depends on your driving goals, local fuel availability, budget, and willingness to manage fuel quality.

For customers seeking maximum flexibility, Auto-Octane allows operation across a wider range of fuel grades. Customers seeking maximum performance from pump gas often prefer a dedicated 91+ or 93-octane calibration. Ethanol-based calibrations such as E50 and E85 typically provide the highest performance potential but require ethanol availability and proper fuel management.

Every ZFG Tune is built specifically for your vehicle, modifications, fuel type, and tuning goals.

Your purchase includes:

• Custom ECM calibration
• Custom TCM calibration (where supported)
• Data log review
• Revision support required to complete the tune
• Tune delivery through HP Tuners and TDN

Additional refinements can also be requested after completion if needed.

Auto-Octane is a fuel type we offer for tunes. Auto-Octane tunes are designed to accommodate a broader range of pump-gas fuel octanes than a dedicated premium-fuel tune, such as 91+ Octane or 93 Octane.

While Auto-Octane provides excellent flexibility, dedicated premium-fuel calibrations generally offer greater performance potential.

Auto-Octane is often a good choice for customers who travel frequently or live in areas where premium fuel availability varies. This fuel type is also well-suited for use as a tow and travel tune.

Certain 2025+ Explorer ST vehicles may be equipped with a Gasoline Particulate Filter (GPF). To determine whether your vehicle has a GPF, please review the emissions sticker located under the hood. If "GPF" is listed on the emissions label, certain exhaust components or systems may not be compatible with your vehicle.

At this time, ZFG Racing is not aware of any GPF-compatible aftermarket downpipes available for the 2025+ Explorer ST. If compatible options become available in the future, we will update our catalog accordingly.

However, some cat-back exhaust options are now becoming available for GPF-equipped vehicles. Most notably, Thermal R&D has recently released GPF-compatible exhaust systems for applicable Explorer ST models.

Custom tuning files, calibration services, software credits, and other digital products are non-refundable and non-transferable.

Most new, unopened merchandise may be eligible for return within 30 days of delivery provided an RMA has been issued by ZFG Racing. Special-order items, electronics, and opened products are generally not eligible for return.

Restocking fees of up to 25% may apply and are determined during the RMA review process.

Order cancellations may be subject to a cancellation fee.

For complete details, please review our Return & Refund Policy or contact Sales before requesting a return.

Custom tuning files, calibration services, and software-related purchases are non-refundable and non-transferable. Tune files may only be used on the vehicle for which they were originally created and cannot be transferred or reassigned to another vehicle or customer.

Physical merchandise may be eligible for return within 30 days of delivery, provided a Return Merchandise Authorization (RMA) has been issued by ZFG Racing before the item is shipped back. Returned products must be brand new, unused, and in their original unopened packaging.

Please note:
• RMA requests must be submitted to sales@tunedbyzfgracing.com before returning any merchandise.
• Restocking fees of up to 25% may apply and will be disclosed during the RMA approval process.
• Special-order items, electronics, software products, and custom tuning services are not eligible for return.
• Customers are responsible for any carrier address correction or rerouting fees resulting from an incorrect shipping address provided at checkout.

Order cancellations may be subject to a cancellation fee. Cancellation requests must be submitted by email to sales@tunedbyzfgracing.com prior to shipment or fulfillment.

The correct option depends on your situation:

Tune Only:
• You already own a compatible device.
• You only need calibration files.

Tuning Package:
• You need both a tuning device and custom calibrations.
• Recommended for most first-time customers.

Additional Tune:
• You already have an active ZFG calibration and need an additional fuel, performance, or other option added to your setup.

If you're unsure which option is right for your vehicle, contact our Sales team before ordering.

Getting started is simple.
To ensure no steps are missed, please follow our TDN Quick Start Guide in Tuning Central (linked below).

Once your tuning device arrives, you'll:
1. Install the TDN App and set up your tuning device
2. Connect the device and read your vehicle's factory calibration.
3. Submit the required vehicle information through our calibration portal (Tuning Central).
4. Our calibration team will review your submission and build your custom tune.

Once complete, you'll receive tune files through the TDN App along with instructions for data logging the latest revision.

Additional revisions may be provided as needed based on datalog review and vehicle modifications.

In many cases, an HP Tuners device can be used with multiple vehicles. Generally, these devices can be used to tune multiple vehicles either simultaneously or over the lifetime of the device. However, compatibility depends on the specific device, device generation, vehicle platform, tuner preferences, and licensing requirements.

Most supported vehicles require HP Tuners credits (licenses) before tuning can be performed. The number of credits required varies by vehicle and application. Additional credits may need to be purchased when tuning another vehicle.

Compatibility may also vary based on the model and generation of tuning device being used. Not all devices support all vehicles or vehicle generations, and not all devices support the same tuning methods (e.g., TDN App and/or VCM Suite).

If you are considering using a tuning device on a different vehicle, or using an existing device on your vehicle, please contact us with the device model and vehicle information. We will be happy to help determine compatibility and any licensing requirements before purchase.

Warranty decisions are ultimately made by the vehicle manufacturer and dealership, not ZFG Racing, and we cannot guarantee outcomes. Any modifications, including tuning, are performed at your own risk. 

Customers should consider potential warranty implications before modifying their vehicles.

We only support HP Tuners devices.
Compatibility of each HP Tuners device varies by vehicle year/make/model, device type & generation, and your mobile phone's operating system (iOS or Android).
All Tuning Packages include the latest-generation RTD (Remote Tuning Device) from HP Tuners.

There's no limit. However many are needed to complete your tune are included with purchase.
You can also request refinement post-completion if needed.

When we say "complete," it means our tuner has determined there are no opportunities for further improvements based on your data logs, tuning goal, fuel type, etc.

What this does not mean: No further changes can be made.

You can request refinements anytime, including adjustments based on your experience over time.

It depends, but most customers complete the tuning process within approximately two weeks of submitting their stock file.

The largest factor is turnaround time between revisions. Customers who submit logs and feedback promptly typically complete the process faster, while delays in log submission will naturally extend the overall timeline.