For a street/strip application that isn't clutchless, a good diaphragm combined with an engagement buffer is going to be a far better choice than the typical SoftLoc style clutch. Less maintenance, less broken parts, and adjustable engagement without going inside the bell. No need to change settings from street to strip, no worrys about lugging the engine and burning up the clutch.

This style clutch might be something different to many of you, but look at what the NMRA Coyote Stock sealed crate engine class is doing with it. They race heads up on a pro tree, and everyone has the same engine. Both automatic and stick trans are allowed, both run at the same weight. Automatics are allowed any converter and a trans brake, sticks are required to run a minimum 10" dia single disc diaphragm clutch. I don't think there are any competitive automatics in the class, most all are sticks running the diaphragm/ClutchTamer setup. Running at 3175lbs, those $6500 NA 302ci sealed crate engines run 10.0 @ 132. The guy in this link isn't using a sealed engine, but it sets the NA Coyote record on it's 3rd pass using the exact same clutch setup, 9600rpm with a diaphragm PP... NA Coyote record run