Regarding your bumper question, you want to buy a Mtech rear. If you go OEM, you can actually order it without the standard diffuser for dual tips.
Duke Dynamics makes a really awesome looking quad diffuser with 3 fins. It's what I have installed on my car. You can check it out my clicking on the link at the bottom of my signature. Go to bimmerkit.com to order.
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E92 335i 6MT | Balloon White | Black Dakota Leather - Sold
PROcede Rev3 V5 | AE Quad Exhaust | BMW Performance Short Shift Kit | Gunmetal 19" M3 GTS Wheels | BF Goodrich g-Force T/A KDW 2 | AST 4100 Coilovers | Swift Springs F:280 R:560 | ER Charge Pipe | Tial Blue BOV | VRSF 3" Downpipes | VRSF 7" Intercooler
http://www.e90post.com/forums/showthread.php?t=782212
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