Exhaust notes from the 2013 BMW X1. Source audio levels for both interior and exterior have not been altered.\r<br>\r<br>\r<br>\r<br>Exhaust notes from the 2013 BMW X1. Source audio levels for both interior and exterior have not been altered. BMW X1 sDrive 18i - Retrofitted BMW E90 320i .\r<br>\r<br>Exhaust notes from the 2013 BMW X1. Source audio levels for both interior and exterior have not been altered.\r<br>\r<br>BMW X1 sDrive 18i - Retrofitted BMW E90 320i Performance Exhaust - Resonator Delete - K&N E-2021 Air Filter. Exhaust notes from the 2013 BMW X1. Source .
