I have a JWT clutch and track it quite a bit with no issues. when I put in the clutch I also put in a Zspeed CSC and a new master because I heard of so many failures. Since then 30,000 miles of no problems (about 5-10 track days a year... 30 total?)
I did however blow my tranny at the track (blew a hard shift into 3rd) so that I couldn't get into 3rd gear without a grind (synchro failure)
Nissan replaced it free under my power train warranty.
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09 6spd Berk CBE, JWT cams, ZSpeed CSC, Stillen (25 row oil, brake cooling, sways, gen3 CAI), Passport (9500ci), Quaife LSD, Z1 400 hp kit, ss lines, pads, rotors, clutch etc, Phunk's pan and fuel starve fix
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