I am not really happy with my current exhaust setup, the car is a 2011 135i with a N55.
I have a BMS catless downpipe, twin 2.5" mid pipes with magnaflow resonators, which merge to a 3" flange.
I have gone through three axleback sections
-Maganaflow muffler which droned and made a whistling noise under WOT
-3" muffler delete, sounded good, no drone, but sounded horrific on cold start and my wife hated it so it's gone.
-Varex muffler. This is basically a 3" straight through muffler which has a butterfly valve, when the valve is closed the exhaust has to go through a separate chamber which makes it very quiet. There is more info
here. This is pretty handy for when I want it quiet but IMO it's not loud or deep enough when it's open.
I was thinking about taking the resonators out of the mid pipes, will this make it louder or just raspier?
Which led me to thinking if the exhaust goes down to a 3" axleback anyway would it make a difference to performance if there was just a single 3" midpipe?
Obviously this would sound different and be significantly lighter. Thoughts, opinions on sound and performance?