Everything is the same unless it's not.
I have had ACT, Spec, and Exedy and I like them all. ACT is my favorite though because it smells like breast milk when it slips. Reminds me of growing up on a farm where you could milk anything with nipples.
This post may or may not have been helpful you're welcome/I'm sorry.
edit: ACT even sprung is heavier than stock. Probably the heaviest clutch I've had. Spec Sprung is lighter than stock even the S3 pucked which always worried me.
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