G101a and a diaphragm clutch controlled by a 'tamer. Coyote Stock cars all use this setup and are running upper/mid 9's @ 140, 3000lbs with factory sealed 302cuin naturally aspirated crate engines. Crowd pleasing 7500rpm dead hook wheelie launches are the norm, broken cars are rare. If you like people taking pictures of your car in action, screaming wheels-up launches are the way to go.
Even organic discs have been known to last a full season in Coyote Stock. Very consistent as well, field is usually as tight as NHRA Pro Stock. Here's a snip from a Dragzine article featuring Coyote Stock champ Clair Stewert, note the second to last paragraph...
With the 'tamer in place, there's no more juggling counterweight and launch rpm as conditions change. Completely eliminates the centrifugal vs base balancing act, as it allows you to adjust the launch separately without affecting high gear clamp pressure. Far simpler way to tune a clutch, and you won't need help from an expert to dial it in.
...If the clutch slips too much or not enough going into high gear, you know you need to adjust the spring pressure.
...If the clutch slips too much or not enough during launch, you dial that in with the 'tamer from the driver's seat.
The ability to control throw-out bearing position during launch can be a game changer.