My Z was making weird noises evertime i gas in and clutch out on first gear and i called the dealer who sold this to me and he is supposed to be a Z expert. He said that is common on the the Z's and 3000gts because of the throw out bearing in your transmission. He said it only does it because of the cold weather and it'll go back to normal once spring rolls around. He also said it wasn't harmful but it gets annoying...I was just wondering if anyone elses Z did that...?