Muffler set (sus φ80x4tip)
Part no.: 4101-20611
Application: F06/F13 640i / N55B30
Discription:

Material: stainless steel（SUS304）
Main pipe: φ60.5mm
Tail pipe: φ90mm / 4 tip
Contents: rear silencer (not come with diffuser on the picture)
Installation: needs to cut factory exhaust and rear bumper.
Control valve: available, and it require to lay vacuum tube and to install control system.

Approved: JQR (Meet Japanese standard)

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

Installation instruction(FYI)
PDF160KB