Hi.

I drove a few g35 sedans before buying the one I eventually did. 2005 - 2010 models. All with manual trannies. 1 was new. And all made a clunk sound as the clutch pedal was released. There's a loud sound from a hard plastic hitting metal. I fixed this by applying some liquid rubber. several coats. Got it at Ace hardware for $9 or something like that. It has made the clunk / thump sound go away. Mind you, it has only been a few days.

adios