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i have a stock RXL and 3 different versions of the EFI chips, Whats the differences and which one is best?
1 labeled FSM582 one labeled FSM583 and one labeled "non-ethanol 1995 650 v1"(currently installed in my 1995 RXL)

I also have the respective ECU's for each chip

any information regarding chips is appreciated and i have a cable allowing me to connect a laptop to the EFI on the way
 
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