Video of my E90 335i Custom Dual 3" Exhaust w/ 6" Custom Catted DP running straight pipe option - filmed outside. Sounds like 1JZ/2JZ!
Setup config to help answer questions.
Starting at turbos:
Dual 3" full radius (not cheated) turbo outlets
Merge to 4" V-band on 6" Cat Inlet
4" Cat out to dual 3" Y-Pipe
Dual 3" exhaust
3" V-band before diff to enable quick straightpipe/muffler swap
3.5" step-up diameter after rear diff
