I have king size box springs that are very old and want to buy a new mattress cuz my back has been killing me. Do I really need to buy new box springs as well? What effect could this have on the overall comfort and effectiveness of the mattress?

I have a 1999 GT with factory suspension and aftermarket wheels. I have somewhat of an idea of how to install the springs but I dont know the correct steps that are involved. I purchased a set (4) of adjustable coilovers from Genki. What special tools would I need for the job and what level of difficulty is it? Thanks for your help! If you know any websites for reference that would help, too.

Every body is telling me that coil over are more expensive thatn regular springs but I found a set of coilovers for a 2000 eclipse for like $50. The item number is 110165505817. Are they knock offs or what. Can anybody tell me what wrong with them or why they are so cheap. Or are they even worth buying?

I have a 99' Ford Ranger pickup that squeeks constantly from my rear springs. It is so annoying. Any ideas on how to stop it from squeeking? I am pretty sure it squeeking at the joints where they connect to the truck.