Clutch disc?
 

Helo.....some days ago i stepped on the car with 2.500 and 4th gear and suddenly i went to 7500!!!!
same happened some minutes ago with 5th gear....
Today it was NOT happening with 2nd and 3d gear....

Do i need a clutch disc?
I found an exedy one really cheap (not 6puck) , should i get it?
Would i also need a pressure plate and the bearing and alignment tool?
How can i "feel" if i need a new pressure plate too??

I ve found a XTD STAGE 3 RACING CLUTCH KIT wich has everything above , and is 6puck for around 330$

The car will soon be a stage , with the oem twins....so around 300whp

Sounds like your clutch is slipping. I would recommend going with the ACT Street/Strip clutch with their HD pressure plate.