I need a reliable tuner to supply a Stage 1 ECU file with DPF-off for a BMW 3 Series car. A clean, checksum-corrected file ready to flash via tools such as KESS, K-Tag, or similar is all I’m after—no extra pops, bangs, or added options. Please work from the stock read I’ll provide, disable the diesel particulate filter routines, apply a mild performance increase typical of Stage 1, and return the modified file along with a brief note confirming the changes you made. That’s the entire scope: one calibrated file, start-to-finish, so I can flash and drive.