[jonathanrayce]

I have a buddy getting rid of a quadzilla X2 off of his 2003. I was wondering what is the differences between the one for the 2003 and the one for the 2006. Is it the wiring harness like most chips? Or, is it in the programming? Or, is there no way to make it work at all?

 

[TVtruck]

It would be different programming....not sure about the harness....prob. different as well.
I'd call Quad and see if it could be traded or reprogrammed.