Anyone looking to go with a Stage 2 tune will need to go with a test pipe/X-Pipe mod. Seller is offering this brand new in the box test pipe at 20% off the new price. $75 is a nice savings and a Stage 2 tune is the way to go in my opinion.
Active Autowerke Test Pipe for E9X M3
https://www.m3post.com/forums/showthread.php?t=1478406