ECU Flash for 2006 M45

[runis]

Gents - Looks like there are a couple of options for a ECU flash all about $400...couple of questions:

1) How hard is it to take the ECU out for shipping?2) How much extra HP/TQ can be expected form this?3) Which has the most aggressive tuning? (ImPul vs. UpRev vs. Jetflash, etc.)4) Is this safe to do on an engine with 5k miles on it.5) Is mapping affected by having K&N Intake and Stillen Exhaust?

http://www.car-stuff.com/carpa...html