Skippy ... this topic really depends on your relationship with the dealer and their stance on their work.
However, I would recommend many many PM's to Hoist on this topic as I think he has beat this horse to death and just might be the site export on warranty and the intentions of breaking it. I am quite sure that after going back through his posts and the replies to his posts you will be well prepared to make your own decision on this topic 
I am not sure if there is a post checker though for the first 1200 posts from a person ... is this a feature request ?? 
Harry's 100% correct! And after beating this to death trying to figure out how to do both, you can't! But you can minimize your exposure. You take your chances with W.....ty if you modify your ECM. You take your chances with your engine if you don't! Weigh your options to decide. By factory edict and to be in compliance with EPA, per the MOCo you void your W.....ty if you do an ECM mod. That said, it must be done anyway. You have 3 choices IMO, PC III, SERT, TMax w/AutoTune. The TMax is a complete ECM replacement and will be the biggest W.....ty voider. SERT modifies your factory ECM and leaves its mark on the stock one. Technically, it voids W.....ty, but many dealers stand behind it since it's an HD part. You must work this out with your dealer upfront, as they give you their personal assurance that you'll be covered. No guarranty thst you'll be covered on the road as the factory's position is officially a voided W.....ty for installing it. Says so when you load it up. Third is PC III. This is an add-on device that leaves not trace and can easily be removed. With only stage I mods, IMO this is the best choice, as long as you're willing to understand the syatem and be capable of removing it if you grenade an engine, I think this is the best choice while under W.....ty! Everyone's comfort level on this issue is different. FTW!!! Make sure you take care of the ECM Mod one way or another or you'll be assured of having to do W.....ty work over those 2 years!

Refer to this thread.
http://www.cvoharley.com/smf/index.php?topic=8943.msg134453#msg134453Hoist!
