Akrapovic slip-on system som kan bygges på med mellomrør og turborør for max effekt og ly - se under tilbehør.
Ellers skriver Akrapovic dette selv om bilen og anlegget;

This slip-on exhaust system is made completely out of titanium, consisting of a muffler with an exhaust valve and a two pairs of hand-crafted carbon-fibre tailpipes to enrich the visual enjoyment of the exhaust, styled with a distinctive round design with titanium inner parts to enhance the rear of the BMW Z4.
In addition to reducing overall vehicle weight, the system delivers extra power and a sporty sound.

The optional Akrapovic Sound Kit provides control of the various sound settings, and adding a stainless-steel Evolution link-pipe set offers further tuning opportunities.

ECE type approval is only valid for cars equipped with otto/gasoline particulate filter.