Had the same thing happening to mine right before I traded it in. It could be a few things. The first thing I'd check is the fluids. The Z's transmission is noisy as f!, but it was noticeably worst. Mine started to "clunk!" when I'd let off the throttle. It was almost like the clutch wasn't engaging, then suddenly engaging. I also found the clutch would sometimes not come up as quickly as it should. This leads me to believe that the it was likely the notorious clutch slave cylinder issue. If your Z is still under warranty, I'd bring it in ASAP! It's an inexpensive part, but a really expensive repair on it's own. Chances are, the part will fail soon.
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[09][MB][6-Spd MT][Touring][Stillen Gen III][K&N][Borla CBE][Evo-R]
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