Couldn't tune? Or didnt want to waste time tuning? Actually I sold that car(XB8) just to cash out- let other people do the leg work- and run an already set-up car (My 777's) in the meantime. I only paid $530 for the thing- and ended up selling with the motor and all parts for a little over $990- I MADE Money! And kept the tools!!

As for the diff o-ring issues. I noticed them right off the bat- that was one of the first things I took out of the car- and it got better- but not good enough.
I messed with the set-up for a few weeka and then just got tired of it. Since then I have bought myself another XB8- and it is dialed- but my 4 777's are still more fun to drive. Each with different set-ups! Only time I really drive the Xray is on the Wet- High Traction tracks. That's the only place it shows its true colors IMO.