Which exhaust?
It all boils down to what sound are you after?
What sounds good to you?
What brings smiles to your face everytime you hear it?
There are many available exhausts out there for our M6 so it becomes a personal decision.
I have the Tubi Rumore and extremely happy with mine.
Here are some video clips.
On
this video, my beast is the 2nd one to take off from the parking lot.
Tubi exhaust acceleration.
Here's what Tubi sounds like inside the cabin.
No drone whatsoever at any RPM.
Here's when it was first installed. Revving on idle.
And
here's is what it sounds like after 1 year break in period.
Listen to a few exhaust out there from different makers, then make an informed decision on what will make you happy.
One important note is DRONE. I hate DRONE. Drone will drive anyone crazy on long drives.
So I recommend you go with an exhaust system that has no drone.