{"product_id":"porsche-911-gt3-rs-4-0-ecu-tune-991-2","title":"Porsche 911 GT3 RS 4.0 ECU Tuning – Optimized Performance | 991.2 2019","description":"\u003cp\u003eThis isn't a generic flash. Our \u003cstrong\u003e991.2 GT3 RS calibrations\u003c\/strong\u003e are developed in-house, optimized on the dyno, and tested on the street and track. Every map is built around your fuel, your hardware and how you actually drive the car — real gains with factory-level refinement and reliability.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eEstimated on a healthy car with known-good fuel:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e520 hp → 545 hp\u003c\/strong\u003e — estimated gain of +25 hp\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e346 lb-ft → 366 lb-ft\u003c\/strong\u003e — estimated gain of +20 lb-ft\u003c\/li\u003e\n\u003cli\u003eFuel maps available for \u003cstrong\u003e91, 93 and 100 octane\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003eSharper throttle response and revised rev limits\u003c\/li\u003e\n\u003cli\u003eCalibrated for consistent performance in all conditions\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eThe \u003cstrong\u003e991.2 GT3 RS\u003c\/strong\u003e runs the 520 hp 4.0L naturally aspirated flat-six — the most highly developed version of that engine Porsche put in a road car before the 992. Be realistic: roughly 5%, from ignition timing, fuelling, throttle mapping and rev limits, because there is no boost to raise. On an engine engineered to this standard there is genuinely little left in the file, and we will not pretend otherwise. What you get is a crisper pedal and a cleaner top end. This is the 520 hp 991.2 car; the earlier 493 hp 991.1 GT3 RS takes a different calibration.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eWhat's included:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eCustom ECU calibration developed around your fuel, hardware and driving preference\u003c\/li\u003e\n\u003cli\u003eOptimized ignition timing, fuelling and rev limits for your specific car\u003c\/li\u003e\n\u003cli\u003eThrottle response and drivability refinement\u003c\/li\u003e\n\u003cli\u003eFuel map matched to the octane you actually run — 91, 93 or 100\u003c\/li\u003e\n\u003cli\u003eOBDII data cable shipped to you\u003c\/li\u003e\n\u003cli\u003eSame-day file turnaround once we have your stock read\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003e\u003cstrong\u003eWhat we need from you:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eYour factory stock file, read with the cable we send you\u003c\/li\u003e\n\u003cli\u003eA complete list of current modifications\u003c\/li\u003e\n\u003cli\u003eVehicle details and VIN\u003c\/li\u003e\n\u003cli\u003eAn honest description of the car's mechanical condition and service history\u003c\/li\u003e\n\u003cli\u003eThe octane you run day to day\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003e\u003cstrong\u003eSupported Vehicles:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003ePorsche 911 GT3 RS (991.2) — 4.0L naturally aspirated flat-six, 520 hp, 2019\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003e\u003cstrong\u003eHow to order:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e1. Order online.\u003c\/strong\u003e We ship you an OBDII data cable — typically 2–3 days to arrive.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e2. Read your stock file.\u003c\/strong\u003e Plug the cable into your OBD port, upload your factory file, then email it to us with a list of your current modifications.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e3. Get your file back the same day.\u003c\/strong\u003e We email your custom calibration back the day we receive your stock read — and we'll make sure you're happy with it.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003e\u003cstrong\u003eIn the Southern California area?\u003c\/strong\u003e \u003ca href=\"\/pages\/contact\"\u003eGet in touch\u003c\/a\u003e and we can tune your car in person instead.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eBefore you order:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003ePower figures are estimates, not guarantees.\u003c\/strong\u003e Results vary with fuel quality, altitude, ambient temperature, mechanical condition, supporting modifications and dyno methodology.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMechanical condition\u003c\/strong\u003e — tuning raises cylinder pressure and driveline load. The car must be sound first. Pre-existing faults revealed or accelerated by tuning are not our responsibility.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAccurate information required\u003c\/strong\u003e — we build the file from what you tell us. An unmodified stock read and an honest description of the car, its modifications and its condition are required.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWarranty\u003c\/strong\u003e — an ECU modification will likely void any remaining factory powertrain warranty.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLegal use\u003c\/strong\u003e — certain calibrations are for off-road and competition use only. Compliance with federal, state and local emissions law is the buyer's responsibility.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRisk and liability\u003c\/strong\u003e — the customer assumes the risk of modification. Our liability is limited to the price of the tuning service.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003e\u003cstrong\u003eNote:\u003c\/strong\u003e Tuning services are non-refundable once the file has been delivered. The service is complete at delivery. Full terms are on our Terms of Service page.\u003c\/p\u003e\n\n\u003cp\u003eQuestions about your specific car? \u003ca href=\"\/pages\/contact\"\u003eGet in touch\u003c\/a\u003e — we're happy to confirm the right calibration before you order.\u003c\/p\u003e\n\n\u003cp style=\"text-align: center;\"\u003e\u003cstrong\u003eFlatSixSpirit\u003c\/strong\u003e — Premium Porsche Performance Parts\u003cbr\u003e\nRemote Delivery · Custom Calibration\u003c\/p\u003e","brand":"FlatSixSpirit","offers":[{"title":"Default Title","offer_id":50065549000954,"sku":null,"price":2488.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0855\/2611\/8650\/files\/porsche-991-2-911-gt3-rs-4-0-ecu-tuning.png?v=1787091832","url":"https:\/\/www.flatsixspirit.com\/products\/porsche-911-gt3-rs-4-0-ecu-tune-991-2","provider":"FlatSixSpirit","version":"1.0","type":"link"}