First, welcome to the SW forum. Second, is your GL a Zetec or Duratech? That will help your direction regarding intakes, heatsoak, etc. I don't know of any shops in the valley that sell anything Contour-specific, but if you check the main contour.org page, go to links...aw hell with it;
here's the link . Scroll down to the Company Pages section and check some of those. CTA comes to mind, as well as Kurtz Kustomz.
Don't know much about the wheel/suspension question. Maybe Kaiser or DARKERIMAGE can show you the way.