A friend just bought a 15 red vert with the auto trans, he is wanting to make the ride not so bouncy. He doesn't care to lower the car if he doesn't have to, doesn't race the car or anything, just wants to improve the ride quality. He asked me about the air ride systems available now but from what I have seen they are $2k-$3k +. Are there any aftermarket springs that will give the car a better/softer ride quality that a ford dealership will install and that WONT void any type of warranty on the car?