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catless headers
it can make problems worse
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every calibration has been developed by a licensed professional engineer
BMW Z4 (2003-2005) MS45 ECU Tune - Stage 3 FIC Fuel Injectors:No catless headersSee our full write up for more details and other tuning options! Stage 3: Specifically developed ECU tuning for vehicles making over 400 bhp 350 whp, or engines utilizing a blow through aftermarket mass airflow (MAF) sensor. Stage 3 includes the same parameter revisions as Stage 2, plus additional modifications to the ECUs program code to support a high flow MAF sensor as well as sensor scaling. Stage 3 is recommended for cars with built engines,
