Unless you're on your way to the state referee testing station of certified modifier for CARB related stuff, I wouldn't drive it. Even for those purposes, you should consider getting a one day temporary permit for transportation. Cops here know what a Skyline is. Straight cop magnet IMHO. Put it on a trailer and enjoy it at the track and other off-road stuff otherwise. You might have to stick to that for a few more years until it's 25. I don't know for sure, but I've been researching it. Cops here do impound vehicles for lot's of reasons, including registration issues, modifications and driving like a**.