BMW 1 Series M140i 3 & 5 Door (F20 & F21 LCI - OPF models only) 2019 and Later. Milltek Sport Exhaust. Milltek Sport exhausts are produced in high quality type 304 aircraft grade stainless steel. This material is anti-magnetic (other manufacturers stainless steel may not be) and is less susceptible to discolouration.
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