This tuning package includes both Stage 1 and Stage 2 calibrations for the 2011 Audi A3 1.6 TDI CR with CAYB engine and Siemens PCR2.1 ECU. Stage 1 improves throttle response and low-end torque, while Stage 2 delivers a more aggressive power band with DPF-related parameters removed. Developed for manual transmission vehicles, these files are ideal for off-road or motorsport use where emission components have been removed or replaced.