24' here and already did downpipes, exhaust, IC, and have ZFG tuner on the way. I was on the fence and was going to wait a few years. I even purchased the extended warranty. Decided on the IC right off the bat and figured how can they deny warranty providing the engine with safer air intake temps? Then said F it and hated the fake engine noise generator and wanted to hear real engine noise and did the exhaust system. I figure how can they deny warranty letting the exhaust leave the engine more freely? But sure the dealer can try anything, so always a risk. The tune is the big one for me, if the engine frags it is easy for them to blame the tune.
All that being said, I decided to not wait. I want to enjoy the vehicle for all the time that I have it and not think about every time I get in it that there is some kind of countdown clock to fun a few years from now. Only thing left is the ZFG tune which is coming in the mail today. IC,pipes, exhaust installed and I couldn't be happier, it really changed my whole driving experience not only from how it doesn't deflate power after a hard pull due to heat soak, all the way to the amazing sound from the thermal system. I can't wait to go for a drives now! Tune will bring it all together and be the final piece for me (maybe).
As always hope for the best but be prepared for the worst. If your engine frags and you can't replace everything back to stock before getting it to the dealer, can you afford a new block and install? Bolt on stuff is fairly easy to return to stock and the dealer wouldn't know otherwise. Big one is the tune, they can clearly see the computers were modified from stock even if you re-program back to stock settings. Warranty stuff like electronics, body, etc a tune can't be blamed on. Pretty much looking at the powertrain as the big risk there.