Yes. We support aftermarket catted downpipes. We do not support catless downpipes or catless exhaust configurations under any circumstances. While downpipes do not always require specific tuning changes, we generally recommend installing them before completing data logs whenever possible. This allows us to review performance with the final hardware configuration installed.

No modifications are required to enjoy the benefits of custom tuning. However, for customers looking to maximize performance, we generally recommend the following upgrade path: Intercooler Intake Downpipes Transmission Upgrades Fuel System Upgrades Turbocharger Upgrades The ideal modification path will vary based on your vehicle, goals, budget, and intended use. Some customers are primarily interested in reliability and consistency, while others are pursuing maximum performance.

It depends on the modification. Some upgrades can be installed without any tuning changes, while others should be installed before tuning begins so they can be accounted for during the data logging and revision process. As a general guideline: ✅ Typically no tune changes required: Intercoolers Charge pipes Spark plugs Most blow-off valves ⚠️ Usually best installed before tuning: Cold air intakes Ram air intakes Turbo inlet tubes Aftermarket downpipes ❗ Contact us before installing: Upgraded turbochargers Fuel system modifications Other major performance upgrades You're welcome to begin the tuning process before parts are installed. In many cases, we can process your tune request, read your stock file, and prepare your baseline tune in advance. Depending on the modification, however, we may recommend waiting to flash the tune or complete data logs until after installation.

Warranty decisions are ultimately made by the vehicle manufacturer and dealership, not ZFG Racing. Because custom tuning modifies the vehicle's calibration, it may affect warranty coverage for certain components or repairs. The impact varies depending on the manufacturer, dealership, vehicle, and specific repair being requested. Customers should consider potential warranty implications before modifying their vehicles.

Yes. Using your HP Tuners device, you can flash your vehicle back to its original stock calibration at any time. Many customers choose to return the vehicle to stock temporarily for troubleshooting, dealership visits, or before selling the vehicle. Returning the vehicle to stock does not delete your custom tune files, and you may reapply your tune later as needed.

Yes. If the dealership performs a PCM software update, your custom tune may be overwritten and replaced with the updated factory calibration. Not every dealership visit results in a PCM update, but it is possible anytime software updates, recalls, or drivability concerns are addressed. If your vehicle receives a PCM update, simply contact our team. Depending on the circumstances, an updated stock file and tune revision may be required.

Yes. FORScan changes and custom tuning operate independently, so changes made in one generally do not affect the other. FORScan modifications made before tuning will remain in place, and flashing a custom tune does not overwrite or undo those changes. Likewise, making FORScan changes after tuning does not require a re-tune. In rare cases, FORScan may report an OSID mismatch when connecting to a tuned vehicle for the first time. If this occurs, please review the troubleshooting tips provided on this page. After completing those steps, FORScan should connect normally whether the vehicle is running a stock calibration or a custom tune.

Yes. Our latest Quick Start Guide can be found in our tuning hub: Tuning Central.

No. Thanks to HP Tuners' support for these platforms, we do not currently require ECU swaps or unlock services for any vehicle platforms we support. Simply read and submit your stock file using your HP Tuners device, and we'll take it from there. Please note that if your vehicle contains a newly released or previously unidentified operating system (OSID), HP Tuners may first need to add support for that calibration. In those cases, additional definitions may be required before tuning can begin, which can extend the tuning process by up to two weeks.

Drive mode behavior depends on the vehicle platform and the tuning option selected. For vehicles equipped with DMS™ (Drive Mode Specific) Tuning, individual drive modes can be calibrated differently. This allows features such as separate power levels, throttle response, transmission behavior, boost targets, and other tuning characteristics to be assigned to different drive modes. For vehicles using a Standard Tune, the calibration is generally applied consistently across all drive modes, while the factory drive mode functionality itself remains intact unless otherwise specified. Because drive mode support varies by platform and model year, specific functionality should be confirmed on the applicable product page or by contacting our team before purchase.

ZFG Tuning is a remote custom tuning service that uses HP Tuners hardware and software. Once your vehicle's stock file is submitted, our tuner creates a custom calibration based on your vehicle, modifications, fuel type, and performance goals. After installing the tune, you'll record and submit data logs for review. We analyze the data, make adjustments, and send revised calibrations as needed. This process of logging, review, and revision continues until the tune is dialed in. Because every vehicle and setup is different, multiple revisions are often required to optimize performance, drivability, and reliability. The entire process is completed remotely, with no dyno appointment or shop visit required.

If your RTD4 will not sync, first verify that your internet connection is stable and that you are signed into the correct HP Tuners account within the TDN application. Restart the device and application, then attempt the sync again. If the problem persists, contact our our team and include screenshots of any error messages along with your order number so we can assist with troubleshooting.

Fuel quality and available octane ratings can vary significantly throughout Alaska. We generally recommend using the highest-quality fuel consistently available in your area and selecting a tune designed for that fuel. When discussing tuning options, please let us know the fuel grades available locally so we can provide the most appropriate recommendation for your specific situation.

Not necessarily. Most vehicles can be tuned safely using the factory intercooler, and many customers choose to tune before performing additional modifications. However, upgraded intercoolers can help reduce intake air temperatures, improve consistency during repeated acceleration, and support more aggressive driving conditions. For customers planning multiple modifications, tuning is often the recommended first step.

Standard Tuning provides a single calibration optimized for your selected fuel and vehicle configuration. DMS™ (Drive Mode Specific) Tuning allows multiple calibrations to be integrated into the factory drive modes, enabling different power levels, fuel types, transmission behavior, and vehicle characteristics without requiring additional flashing between calibrations. DMS™ provides greater flexibility while maintaining factory-style operation.

For most tuned Ford and Lincoln EcoBoost vehicles, we recommend NGK LTR7BHX spark plugs (95605) gapped to 0.028". For heavily modified applications, including many big turbo setups, a 0.026" gap may be more appropriate. Always verify spark plug gap before installation, and we recommend using a feeler gauge for the most accurate measurement.

We do not recommend running a lower-octane fuel than your tune is written for. However, occasional use of 91 octane on a 93-octane tune is generally acceptable. Performance and consistency may be reduced compared to using the intended fuel grade. If 91 octane is the highest-quality fuel regularly available in your area, a dedicated 91-octane is recommended.

To ensure your vehicle performs as intended, it’s important to consistently run the specific fuel type your tune was designed for. The fuel type is noted in the file name of your tune. Using lower-octane or inconsistent fuel can impact performance, drivability, and overall reliability. If you’re considering changing fuel types (e.g., switching octanes or moving to an ethanol blend), we recommend reaching out first so we can confirm compatibility with your current calibration or advise on next steps. Please note: Your tune file notes and any direct guidance from our team will always take precedence.

Proper maintenance is key to ensuring your vehicle runs safely, reliably, and performs at its best with your custom tune. We recommend staying on top of the following: • Engine oil: Check regularly and run ~0.5 quart over (especially if launching or driving aggressively) • Service intervals: Shorten intervals and stay ahead of routine maintenance • Fluids: Check levels consistently and adjust as needed (engine, trans, etc.)

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.

Yes. All ZFG Tunes include custom calibration for the engine (ECM) and transmission (TCM). We don't write ECM- or TCM-only tunes. The price you see is the price you pay for a full, custom tune.

What's the difference between a custom tune and off the shelf tune (OTS)? Custom Tuning: Custom tuning creates a personalized tune based on your personal goals, preferences, and feedback, as well as your vehicle's specific setup and modifications. Custom tunes are written and refined over time rather than being "one and done." This approach offers the most precise adjustments available, resulting in the best performance and increased customer satisfaction. We work very hard to make sure customers get the power and driving characteristics they are looking in each of our custom tunes. Off-The-Shelf (OTS) Tuning: OTS tunes are pre-configured, "one size fits all" tunes. They are written with the intention of being generic and broadly compatible, based on what's been tested on one vehicle. OTS tunes may not fully optimize performance due to their nonspecific nature.

To reset your password, click Log In → Log In with Email → Forgot Password Follow the instructions sent to your email.

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.

You can track order status by logging into your account and visiting the 'My Orders' section.

Maybe! Please contact us.

We accept credit cards, debit cards, and more.