Well today I discovered one pipe had baffles at from the front 44, 52 and 11 from the rear.

The other pipe was from the front 44, 52 and 11 from the rear.

So one pipe had 4 baffles and the other 3. It makes me wonder if the ECU was programmed to compensate for unequal back pressure.

2019 M3W Sold and is now in Las Vegas enjoying the showgirls :-)