too bad, always kinda liked the oem clutch!
it's an old platform, you'll find gm/delco is just rebranding a lot of junk parts since they don't make enough money manufacturing them anymore. same with any old car from any mfr
all the same, they wont take it back, right? try another hundred miles or so before you make any decisions
a lot of clutches i've done have a bit of vibration, then they break in and it goes away
'97 z28 m6. built for DD torque. obd-i, lunati 262/270 cam, cc915, aluminum 1.5rr, mids, etc