Mine was the first installed at Coopers Reading and I indeed had to take the car back due to the knocking from the Exhaust. It was a bolt that kept catching the under part by the footwell. Took them an extra day to fix it.
No issues since. It is the best investment you will make!
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X5 40d M F15 - July 2018 - Space Grey
Mini JCW F56 - June 2018 - Rebel Green
Previous: 340i M F31 2016-18, 2015-16 435i M F32, 2013-15 330d M F30, 2011-13 Mercedes C250, 2008-11 320i E92
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