Muffler set (sus φ80x4tip)
Part no.: 4101-18915
Application: E89 Z4 20i / N20B20
Discription:

Material: stainless steel（SUS304）
Main pipe: φ50.8mm
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: not available

Approved: JQR (Meet Japanese standard)

Noise level for reference
(It might be different depending on the condition)

81dB at 3750 rpm