F97/F98 BMW X3M | X4M - S58 DownpipesThe LAB Performance Downpipes for BMW F97 X3M F98 X4M (Track Use Only) Unlock the full potential of your BMW X3M or X4M with The LABs Performance Downpipes. By eliminating the backpressure caused by stock catalytic converters, these downpipes allow your S58 turbos to spool faster and achieve maximum power output. Key Features: Smooth bends for maximum airflow with no drone Up to 30HP increase on stock turbos with a tune 3 inch diameter for
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