Thishigh-grade lightweight titanium system, finished withhand-crafted carbon-fibre tailpipes, weighs in at35% lighterthan stock and features a pair ofcollectors cast in the in-house foundry. The Slip-On Line (Titanium) comes with a specially developedAkrapovi control kitfor a complete sound experience. The sound character offers a rich tone at normal cruising, rising to a deep sporty sound when the M3/M4 is driven more dynamically. It serves up aperfect sound at all rpms, delivering comfort and sportiness in one exhaust. A ground-breaking octagonal shape has been fashioned from lightweight titanium with a carbon-fibre outer sleeve for the tailpipes, and for more traditional buyers there is the classic cylindrical design.

The system deliverspower increasesof 8.0 kW (10.9 hp) at 6,000 rpm and atorque gainof 13.9 Nm at 5,000 rpm when tested on the Akrapovi dyno against a BMW M4 Competition with a standard stock exhaust. Remapping is not needed for this configuration, and it fits all vehicles (OPF and non-OPF), but the ECE certificate is valid only for cars equipped with an OPF filter.

Optional link pipes and downpipes are availablefor customers looking to change the exhaust for closed circuit usage. An optionalAkrapovi Sound Kitis also available. With the installation of the optional link pipes, downpipes, and Akrapovi Sound Kit, ECE type approval of the Slip-On Line (Titanium) is no longer valid. An optional hand-crafted carbon-fibre rear diffuser is also available to add an extra visual impact to the Akrapovi tailpipes.

The exhaust system also fits xDriveand M4 (G83)Convertible models.

The Slip-On Line (Titanium) exhaust system is ECE type approved for cars equipped with an Otto/gasoline particulate filter.