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It really depends on the strictness of your dealer. Some people say that to void a warranty it has to be proven that the mods was responsible for the problem, and hence not covered under warranty. Some dealers will just look ata modded car and say its not covered under warranty. I believe Audi sells Eibach sport springs that are similar, if not identical, to the Pro-kit springs. Since Audi sells them, they should not affect the warranty. I think Clair has them. To find out for sure what does/does not void warranty, its best to call a dealer.