When i first bought my r33, I had a hand written drive off tag. Was pulled over for speedin on I75. No insurance, no tag, no proof of purchase (bill of sale) etc. The cop let me go with only a speeding ticket. He did feed me a story about how they impounded a skyline a few weeks prior for no proof of registration. I think he was just trying to scare me though because if he was serious they would've impounded mine. Since then I've been pulled over countless times. Never had any problems, never threatened to have it impounded besides that 1 incident either. So no, the cops won't bother you. Its just 90% of this forum are the people with 'I hate cops because its cool' attitude. Cops are like wasps, don't bother them, they won't bother you. And if you do get pulled over chances are you were in the wrong.