if you buy one off ebay, dont ask for help here, as we will not know anything about it, all chips are diferent. the one from the acid mods shop don't need any resistors. if you buy one that does need a resistor, it is most likly hazers code, which is free open source code that one of our members wrote and someone else is selling.
why would you consider ebay before the am shop??
if you buy ebay, you will get no customer service, if you buy here we can walk you through the install.
good luck to you