Originally Posted by JoeDogInKC

Check your dealership out, if they have an aftermarket department. I just had the Eibach Pro-plus system installed on mine for $1495 installed. The kit alone at Eibach's website sells for $1401. I also had Flowmaster Competition catback exhaust installed for $925. Parts on that were around $850, everywhere I looked online. Not only was it a sick deal, but it's all covered under factory warranty now!

Originally Posted by jsimmons

For parts alone, you need (at the very minumum)

Springs = $100-150
Camber bolts = $25

Highly recommended (but not absolutely necessary):
Shocks = $400
Caster/camber plates = $300
Panhard bar = $150

If you lower the car more than 1.5 inches in the back, you need one of these to either adjust the pinion angle (using adjustable control arms) or mitigate the change in pinion angle (drive shaft):

Adjustable rear upper control arms
Adjustable rear lower control arms
One-piece DSS aluminum drive shaft (the one with the CV Joint) = $700

If you need someone to do the work for you, shop rates vary from $50 to $100 per hour.

It takes at least an hour to do the back springs, and a couple of hours to do the front springs.

I think $470 to swap out springs is reasonable if that includes the alignment. I had a shop do an alignment on my car after I installed my shocks/springs, and it cost $180.