Finally i had time to go and make this happen. Basically all it is is a BMS downpipe with the split cut off and then mated to a 3 inch pipe all the way back to the Custom muffler. I'm proud to say i'm the first one to do this on a 335i!. One would think that this exhaust would be really loud but it is actaully the tamest exhaust i've ever heard (the muffler is very packed). For it being fully catless, it seems like its not even as loud as my old setup (berk dp/stock exhaust). It does have a unique sound to it though.
Here are two really short videos of how it looks/sounds. I will be updating this thread with a better video when i have the time.
EDIT: Another sound clip!