I am about to take my 87 GN in to get it smogged. I just bought it from Oregon. It runs good and made it back with no problems. Everything is stock. It has 155K on it. I changed the oil and am going to check out the spark plugs tomorrow...It sounds like it might have an exhaust leak but I can't tell for sure. It has 3in. headers/downpipe and high flow cat...any suggestions one things I should do or look for before I go in would be appreciated..I hate trying to pass smog in CA!!