OK guys here's what I'm planning on doing:
Taken from marcel_b's thread with regards to using the larger 335is oil cooler ducts, I'm going to remove the foglight and install these 335is air ducts and hack them or do whatever I need to do in order to make them fit on my E90 sedan. Here's a comparison of the stock 335i vs 335is ducts:
335i:
335is:
