what year did nissan revise the springs because im gonna buy some springs from this guy but told me that they are off his 04 enthuz...im not sure if they are revised are unrevised

Most likely they are revised.

Mid year to 04 they switched to the revised springs due to complaining customers. Z's that were still in the dealership were switched out for the revised, so the chances that an 04 is unrevised is almost zip.

Your best bet is trying to find the markings on the springs. They are the best indicator of what you really have. Two red dots and one white dot marked on the rear springs are unrevised. If the springs have two red dots and one light purple dot, then those are revised.