Hell savage: Party balloons don't work IMO. They bunch up and limit down travel. I use Thunder Tiger accordian boots. They work much better, are easy to get on/off for cleaning and don't rip.
Forget Losi inner steering rod ends-they break. Go with Kyosho P/N KYO1296
If you're getting a C6 get the RB 2045 pipe with the 92mm & 98mm headers. Yeah, they're stupid expensive but nothing else works as well on that motor.
Also, get the Dynamite long lasting aluminum shoes. Everything else wears out way too fast.
Heat shrink doesn't last on the cvd's. Get the CV Condoms- a must have.