My experiences wth Horizon (although not specifically Evolution so perhaps I'm unqualified to provide input) is that if you have a product in for repair that does not meet warranty standards they will call or e-mail you. Both have happened with me. Then again you had to provide a phone number and e-mail address for those to happen.

So if that information is not satisfactory so be it. In many years of working with Horizon I've never had reason to complain about the service or their service policies. Some of those times have included engines returned for service as well. Just not Evolution engines. With the number of Evolutions in use I'm sure you won't have all that many people to obtain a response from.