spring rates for front coils and rear leafs on a couple of online sale sites offer several spring rates, I'm considering new ones front and rear, my car will have the 2.3 turbo T5 and stock pinto 8" rear w/ open (for now) 3.40 gears. Is there a better rate over stock to buy? And are the mini stock springs a lowered spring in the rear or just a stiffer factory ride height spring? Thank Jim