My 2015 had an awful really loud BB. Tried the redline stuff but while it imporoved it slighly it was still really loud. Spolied the whole experiance as it drowned out the lovely exhausts, yes those bevel boxes canbe that loud

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2015 Morgan 4/4 (Wolf fettled) previously 2014 M3W
MINI Cooper S and numerous BMC/BL relics.