S60R '06 upgrades Looking for help

[EIB S60R]

S60R upgrades Looking for help - should I go the ipd route - downpipe, ECU & exhaust or is there a better way? Also - body kits, who's and how to make sure you get the right fit. I'm looking at getting an '06 S60 R stock very very soon and kicking it up for extreme street use - don't necessarily want to go (very much) faster than the speed limit, I just want to get to the speed limit very fast - especially on the highway, and look good doing it for a 50 something in Chicago.

Thanks in advance.