I don't know any in SF. sorry but a place like Midas could do exhaust stuff. I had me resonator removed from there. No problems and it took only 20 minutes. You might want to call up some performance shops and see what their prices are. Performance shops can sometimes be more expensive than a regular shop. Its tough to find a Ford Contour knowledgable performance shop as our cars are not the most common car to do mods on. If you did find one it would be a rare find and would be worth sharing with all of us, haha.
