While no modifications are required, we recommend upgrading the following components (in order): Intercooler, Intake, Downpipes, Transmission, Fuel System, Turbos. Please see the ZFGR Recommended section for detailed information about how these components impact performance and why we recommend them. You can purchase a combination of these items at a discounted rate with our Parts Package Discount. Our Stage 1, Stage 2, and Stage 3 packages also offer a logical and progressive build. When following the sequence of staged packages, they include tuning and parts in order of recommendation.

Short Answer: You can usually start the tuning process before parts are installed, but in many cases, you'll want to wait to flash the tune and complete data logs until after installation. Getting Started (Before Parts are Installed) You're welcome to begin the tuning process even if your parts haven't arrived or been installed yet. This allows us to get everything prepared so you're ready to go once installation is complete. Your first steps are: Set up the TDN App and your tuning device Read the stock file from your vehicle Submit a Tune Request through our website (Tuning Central) Once your request is processed, you’ll receive your baseline tune along with data logging instructions. There is no time limit on flashing the tune or completing logs—take the next step when you're ready. When Should I Flash the Tune or Data Log? Whether you should proceed immediately or wait depends on the parts being installed. Below is our general guidance by modification type. Intercoolers or Charge Pipes: ✅ Proceed with tuning No tuning adjustments are required, and tuning does not optimize the benefits of an upgraded intercooler. Spark Plugs (OEM, Step Colder, or Different Gap): ✅ Proceed with tuning No tuning adjustments are required, and tuning does not change performance with step colder/different gap plugs. Cold Air Intake or Ram Air Intake: ⚠️ Install first, then proceed with tuning While some intakes do not strictly require tuning adjustments, data logging with the intake installed ensures optimal performance and accuracy. Turbo Inlet Tubes: ⚠️ Install first, then proceed with tuning These significantly affect airflow and should be accounted for in the tune. Note: If turbo inlet tubes are added after a tune is already completed, the tune should be updated. Downpipes: ⚠️ Install first, then proceed with tuning While downpipes do not always require tuning adjustments, data logging after installation ensures optimal results with aftermarket downpipes. Blow-Off Valves (BOVs):  ✅ Proceed with tuning (most setups) For stock-turbo builds and most vehicles, no tuning adjustments are required. Upgraded Turbos or Fuel System Components:❗ Contact us before installing These modifications do require tuning adjustments. We recommend submitting a tune request in advance and suggest allowing up to two weeks' notice for these upgrades. Still Have Questions? We're happy to help you plan your build the right way. 📧 Sales@tunedbyzfgracing.com For a step-by-step breakdown of what to expect, see: FAQ - How does the custom tuning process work?

Yes - we support aftermarket catted downpipes. We do not support catless setups under any circumstances. Feel free to review downpipe options we carry for your vehicle at the link below: