Like DaJackson said, The remote start is engineered by Kia to work with their cars. The Eibach springs are not. Lowering the suspension causes all kinds of potential issues with wheel alignment, suspension dynamics, tire wear, and ride quality. If Kia were to design lowering springs (which they probably won't) that were meant to go in one of their cars, then the dealer would install and warranty them. Since the dealer (or Kia) can't guarantee that the
aftermarket springs won't cause issues then a) they won't install them and b) they'll void the warranty.
As a former dealership technician, I can tell you that no dealer I've ever known will install
aftermarket parts unless they're approved by the vehicle manufacturer. The only exception may be if you were to sign some kind of waiver essentially releasing them from liability and voiding your warranty. I suppose there may be dealers out there that would do this but I'd be pretty surprised if they did. If Kia found out and wanted to get nasty, they could potentially take the dealership licensing away.
I could tell you lots of stories and examples of this that I've seen but, you get the idea.
There are sometimes cases where certain dealers have permission do to this kind of stuff or a manufacturer will authorize certain
aftermarket parts as ok. In other cases the manufacturer may work with a
aftermarket supplier to design and approve
aftermarket parts kind of like Kia was doing with the modified Stingers at the SEMA show.
The last type of thing I've seen is where the manufacturer approves a 3rd party to modify their vehicles in a way that's been tested and approved by the manufacturer and then they are sold at the dealer with a full warranty. Examples of this would be like Shelby and Ford but there are many other smaller companies that do it as well. Locally we have companies that are factory approved to modify pickup trucks and then they're sold new at the dealer with a full warranty.
Sorry for the long post but I thought maybe it would help explain.
