Can you mix clutch parts?
 

So I finally need to upgrade my Exedy stage 2 clutch to something beefier but I'm wondering if I really need to upgrade the whole unit. Couldn't I reuse my existing Exedy pressure plate and purchase a new disc from ACT like this one?

http://www.nolimitmotorsport.com/prod/ACT-6240508

What do you guys think?

Yes you can,but im sure some here would say not to. As long as the dia. is the same & the thickness is not way different. I dont see as a problem.

I have personally run Exedy pp & clutch net disc in my FC,& will be doing the same on my FD...

I was also looking into running a clutchnet disc with my Exedy pressure plate. What setup are you running and how much power/toque are you pushing through it?

As long as it's the same clutch type (i.e. push & push), you can mix them. However, you need to make sure you are matching the right pieces to get the desired outcome. I use an ACT Pressure Plate with a sprung 6-puck from Racing Beat.