IRL F97 F98 X3M X4M DownpipesUpgrade to the IRL LLC downpipes to eliminate the backpressure caused by your stock catalytic converters. By upgrading to our downpipes, your turbos can now spool faster and achieve maximum power. 30HP increase on a tuned S58 with stock turbos. The flex pipe Section will help reduce the stress and unwanted vibration from the downpipes. Features Smooth bends for maximum airflow without any drone Up to 30HP increase on the stock turbos Professional
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