Check the guides. May need some grease or replacement. I was having this issue on several of my M3 windows. I replaced the guides for the front windows and lubed the ones on the rear windows and no more noises.
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2011 370Z 6MT Sport Gun Metallic | ARC | CJM | Ecutek | FI | Fujimura | R2C | SPL | Stillen | TWM | Z1 | ZSpeed |
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