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the diffuser is engineered to emphasize the shape and presence of the Akrapovič tailpipes
an included OEM quality high pressure line
Akrapovič offers a range of complementary upgrades:
the curvature of the inlets has been optimized to minimize flow resistance
If you want to go a bit louder
Adro Carbon Fibre Rear Winglets - BMW 4 Series G22 (2020+) C30 the diffuser is engineered toADRO Carbon Fibre Rear Winglets for the 4 Series & M440i G22 model. As official ADRO distributors, we offer the full carbon body kit for the M440i including a front splitter, rear diffuser, side skirts and a rear winglets. This carbon fibre is composed of a 2x2 weave, typical of most OEM carbon fibre pieces and comparable to Genuine M Performance parts. Compatible models BMW 4 Series (2020+, G22) BMW M440i (2020+, G22)