Hey Sarge! Nice to see you here. I called ACE this morning, they said they MAY offer some upgrades to the S2 version owners in late spring possibly. The upgrades would possibly include: through screwed diff cases, and the new carb with the upgraded venturi. This is ONLY if ACE can get enough "Upgrade Kits", they probably will not offer the new heads because the "OLD 1 is fine" according to tech support. SO once again this leaves all the old S2 SUCKERS, I mean owners to foot the bill once again. I just can't see spending $800 bucks for this piece of *!@#* and having to fork out another $200 just to get something I can run! Just so I can spend more money on new diff gears once I get to run it! All this just to put more money in :greedy: ACE HOBBIES pocket :greedy: ! That SUCKS!!@! :disappoin :thumbdown :angry: