Akrapovic BMW M3/M4 Sports Cat Catalytic Downpipes In Titanium (G80/G81/G82/G83)Developed to be used in conjunction with the Akrapovi Slip On Line (Titanium) and the Evolution Link Pipe Set (Titanium), this high quality stainless steel downpipe set features a pair of sporty catalytic converters (200 cpsi) with heat insulation. The front part of the downpipes is cast in the in house foundry, providing a perfect fit. Delivering a pure racing sound full of emotion, this provides great feedback at high revs, without drone. Remapping