I'm not sure what the answer is, but I'd be VERY wary of any of these "extender" products unless they were an authorised BMW accessory and had appropriate testing standards markings.
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BMW F22 M240i; F48 X1 25i, BMW F20 M135i
Peugeot T9 308 GTi 270
Renaultsport Megane 3 Trophy-R, Renault Clio Sport 182.
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