rx lipo in nitro buggy
 

Can I run a RX lipo in a Nitro Buggy, if the servos are rated at 6v?

Yes you can but not directly. You'll need a UBEC of sorts to drop the voltage or you'll fry the servo. I use the one from Hobbyking and got half a dozen. They're like $7 each. You can also get the ones with noise suppression but they're more.
Here is the one I use. http://www.hobbyking.com/hobbyking/s...idProduct=3735

would any of these work?

http://www.hobbypartz.com/ubec.html

Here is the answer

http://www.amainhobbies.com/product_...tage-Regulator