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Thanks for the info. Well I have an 03 ecm from a work van with a 4 speed auto. Which is what I will be using from the ZJ. I can get a custom flash from a place in Oregon if need be for like $300 which isnt awful but I'd rather not spend it. So if the ecm is newer than 00 I will be fine regardless of vin? I am using all emissions. Not straight piping this is my daily so I dont wont to be deaf.