One more question, I noticed Carolinas R/C has the 777SP1 + SP2 conversion kit for under $600. Other places sell the SP2 kits for around $700 dollars? Are these the same kits? I noticed the SP2 kit mentions the 3 standard diffs eliminating the LSD diff. However the SP1 + SP2 conversion kit mentions nothing about it. I just want to make sure I get all the upgrades of the SP2 and not just the chassis/shock stuff. Thanks