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For the tailpipes I cannot comment, but for the gearbox: Which driving mode are you using? If it is on Sport (or sport+) it is a bit jerky...try Comfort or EcoPro and it should be fine. If not, then 99% it is a software problem and should be resolved by your dealer. The 8-speed ZF autobox is smooth as a cream in its gearchanges...you should not feel them at all.
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2011- : BMW 116i (F20)
2009-11: BMW Z4 2.5si (E85)
2007-09: Mini Cooper S (R56)
2005-07: BMW 325ti (E46)
2004-05: BMW 318i (E36)
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