Here is a video of mine.
It gets louder after a month or two.
For you who just securing the flap open all the time, it doesn't work like that.
The regular muffler, the chambering design is different than the MPE.
MPE muffler is straight through from outlet to outlet. While the stock muffler is chambered.
And in order to get MPE installed to 540i/ix, these are what you need.
- MPE
- MPE for Tips (is a MUST)
- M550 Rear Valance (is a MUST)
or
- M550 M Performance Rear Valance (is a MUST)
- M Performance Plastic Diffuser (is a MUST)
or
- M Performance CF Diffuser (is A MUST)
Oh, and after a few months, the tips will start to rattle.
I am on my second set of tips, and it still rattle.
Now, I need to dig around 1+ years of invoices to get it warrantied again.