Z clutch question

[jwomack1547]

I tried digging for an answer here but couldn't find anything similar so..

Day before yesterday I visited a drag strip to watch. There was heavy stop and go traffic to get into the parking lot. About 5 to 10 minutes.

Yesterday going to work I noticed a weird sound kind of like a rattle, but not like the one where you take off from a start, in the high rpms 6500+. Everything works fine the pedal is a bit spongy but I read that's the Dot3 issue and it's a dark color and I need to change it.

Later that night the gear was put in wrong and it reved to redline or a little in the red. There was a burning smell after this kinda like the burning clutch smell, probably was. I don't know if I am hallucinating after that happened but I thought I smelled it faintly at higher rpms then on out.

I haven't tried to drive it today yet. What could the rattling be and I tried to rev high and shift into 5th and the clutch seems to grab fine no slipping. So am I still good or do I need to get a new clutch. Nissan dealership here said he thinks it's about 3 grand to replace.