Hello qduk, thanks for the questions! I will answer them in the order that you asked (except for #1, as it is a statement!)
2. How much are these to install at a shop? I have no experience at all.
Installation costs vary depending on the hourly rate that your shop would charge. I would consider 5 hours labor + alignment to be a fair estimate.
3. Do I need to replace anything else when putting in these coilovers?
While it is not necessary to use anything else when installing these coilovers, many of our customers have opted to purchase new upper strut mounts and bearings with their kits to keep the factory units together as one piece, and avoid the need for a spring compressor.
4. Are they still 499 shipped?
That is correct, they are $499 shipped within the lower 48 states.
5. If I go to trade my car in in 2 years for it matter I have coilovers?
While it should not matter to any dealer that you have installed aftermarket parts on your car, there are many who may consider it to have devalued the vehicle for trade in purposes. On the other hand, others consider the addition of aftermarket parts a positive and therefore your car can be worth more... It will all depend on your dealer.
Personally I keep most of my original parts (if they are in working condition) such as the suspension just in case I wish to put it back to stock before selling it or trading it in.
I hope that helps!
Glen @ AMI