Zetec
Not sure bout the sound
Clean the sprayers with something
Yes but it's never gonna be really fast unless you drop over $5k into it.
But look at the modification page on the main part of this site and look at the sticky posts in the zetec forum. Intake,exhaust, cam gears, UDP, optimized TB, and chip do help out a lot. And a header if you have the money to make it fit.
Some advice I wish somebody would have given me: Don't drop more than a couple hundred into the contour. Unless you have lots of money to spend on it, you'll never really be happy.