Due to cooling issues that engine has.
It needs more cooling than the standard models. Normally both vents are closed on the bumper, the M135i has one open vent for better cooling, the M235i two in some countries due to higher air temperatures.
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2022 G21 Alpina B3 - DG/COGNAC - 8ZF
2019 F82 M4 S55 ZCP - SO/CLOTH - DCT (Sold)
2017 F87 M2 N55 - LBB/LCNL - 6MT (Sold)
2005 E46 M3 S54 - TS/GN5TT - 6MT
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