TP-CT/68 Tail Pipe Set (Carbon) BMW M3/M4 (G8X) - OPF/GPF 2021+A ground breaking octagonal shape has been fashioned from lightweight titanium with a carbon fibre outer sleeve, totally in keeping with lines of the car. For more traditional buyers, there is the classic cylindrical design, also constructed from same materials, but featuring an update to the current range of tailpipes for BMW cars available from Akrapovi.