This will be a guide to most of the undercarriage suspension/powertrain torque specs. I think it's a good idea to go thru these prior and after track sessions (or as part of an annual maintenance program). Things do shake loose, especially after time or stress.
I use rhino ramps- allows me to get to all the "front" bolts/nuts and then in the rear for the back stuff. Most of your suspension stuff needs to be torqued under load ie on ramps, so this accomplishes this requirement.
A couple of other things, many of the rear components are difficult (or impossible) to get to w/ a torque wrench- these you will have to use your best judgement on how to (and how much) to tighten. Many can best accomplished by doubling up w/ combination wrenchs for more leverage. I like to use 6 point stuff (including combination wrenches) for most of the bigger stuff, less chance of rounding off a nut/bolt off.
I use two torque wrenches- a 1/2" drive for the bigger stuff (60 ft lbs +) and a 3/8" for the smaller stuff (under 60 ft lbs). I use the Craftsman digi torq models as you simply dial in the torque number looking into a small viewer. You will appreciate (and need) a assortment of extensions.
IMPORTANT!!! I've tried to carefully edit all of the specs, if you see any that are wrong please let me know. Also note these are from the Impreza 2002 service manual- other models/years may differ.