If and when you put on the rear springs, either cut off the rubber hose on the rear coil springs and use a spring wrap instead, OR seal the ends of the hose with RTV silicone so that moisture cannot enter the hose. Use a liberal amount of it too. Search for my post from about six months back for the pictures and the reasons why. Since you are up north that may happen to you sooner than it did me. Not a problem with a BAT spring but a problemwith any spring that has hose on it in a moist environment.
Former owner of '99 CSVT - Silver #222/2760
356/334 wHP/TQ at 10psi on pump gas!
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'05 Volvo S40 Turbo 5 AWD with 6spd, Passion Red
'06 Mazda5 Touring, 5spd,MTX, Black