Cutting the bumper is fairly easy just draw out were you want to cut and tape the area thats being cut out something so you have a guide to keep the cuts straight. I cut the bumper on mines to provide more flow to the intercooler and besides 1gb laser front ends are kind of wack.

What yr/ model dsm do you have.

As far as painting the intercooler, thats kind of unnecessary and ricey.
And what if you mess up, then youd be screwed, you hurt the efficiency of the intercooler when you throw paint on it. Now a very light coat wouldnt hurt but i dont think its worth the effort. Not to sound hypocritical, but I painted my intercooler all black but obviously for the opposite reason of what you want.

You dont need to put dsm on your intercooler , people already know its a dsm by looking at it and if they dont then they dont need to know what it is.