2004 mitsubishi lancer ralliart. When i start going it has a weird rattling noise while in gear. it makes a loud pop if i down shift to slow down.Trying to figure out what the problem is. The clutch kit is 2 months old is an exxedy stage 3.

 

Maybe trans mount is bad/loose if not that possibly pressure plate bolts? I would check over the stuff that was apart when clutch was done