Anybody ever tried this little gizmo?

No experience here, but it's hard to imagine accel pump shear plates helping a WOT 2-step launch. I think they would improve street/strip driveability, especially with a big carb, clutch pedal, and not much vacuum.

Grant
Would you mind expounding on how it can help with a low vacuum signal? That might get my attention, since my truck has only about 6hg at idle.