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if its like every thing else its most likly the motor & gearing. i have all so seen cars that are set up like the pro's or wold class winners and its given a diffent lettering.
 

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the bk1 was a all graphite xxx with some eye candy

the bk2 had the variable length arm setup.diffrent rear end setup and diff tranny.

the cr buggy has the new ea3 material. the variable length arm setup from the bk2. It has a diffrent rear end,diffrent bellcranks and the original xxx tranny.


Thats pretty much to sum things up. Theres some other small things but those are the major diffrences.
 
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