Muffler set (sus φ80x4tip)
Part no.: 4101-18911
Application: E89 Z4 3.5i / N54B30A
Discription:

Material: stainless steel（SUS304）
Main pipe: φ60.5mm
Tail pipe: φ80mm / 4 tip
Contents: rear silencer, mid-pipe
Installation: needs to cut factory exhaust and rear bumper. (not come with diffuser on the picture)
Control valve: available

Approved: JASMA (Meet Japanese standard)

Noise level for reference
(It might be different depending on the condition)
71dB at 660 rpm
83dB at 4350 rpm

See more pictures