This is the best place to get an intake manifold ported and polished. I e-mailed them and they said they can port and polish the intake manifold on the any Vibe for around $395. Not bad for 15 to 25HP. Your car will be down for a few weeks while they do the work is the only draw back. Plus the dealership would never know you did it.
http://www.extrudehone.com As a claim to their abilities ... Ford sent the intake system from the SVT Contour to them and got 25HP over stock.