Stage 3 S3 2.0 TFSI — MED9.1 387951 Bosch — Stage 1-3 Tuning Pack ECU Tune 0261S02342

• Initial release of a complete Stage 1-3 tuning package for the Audi S3 2.0 TFSI (MED9.1).
• Provides a full tuning path from a stock vehicle to a hybrid turbo setup.
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• Package includes four files: Original, Stage 1, Stage 2, and Stage 3 (LO380).
• Confirm ECU numbers (Prod: 8P0907115H, ECU: 0261S02342) and software 387951 before flashing.
• Stage 1: For a mechanically stock vehicle. High-octane fuel recommended.
• Stage 2: Requires a high-flow downpipe, upgraded intake, and intercooler.
• Stage 3: Requires a LO380 hybrid turbo and all supporting Stage 2 modifications, plus an upgraded fuel pump.
• Stage 2 & 3 are for off-road or competition use ONLY.​