This was fitted when in for the full m365 package, the quality of parts is superb. As for effectiveness I can’t say but less restrictions in the exhaust is no bad thing and the car now flies
Good quality and very satisfying.
Very well manufactured, it was the missing link to our system, finally restocked. Coupled to a sports cat downpipe and Scorpion gpf back system is sound is awesome but not droney. Also allowed us to go M365