Anyone running one of these.
http://www.moretraction.com/

A couple of local gm grudge race guys swear by it. A heavy cutlass with a 632 and nitrous runs 1.21 60ft with it.
http://www.youtube.com/watch?v=5tkA_pbGG78&feature=youtu.be

'33 Plymouth 5 Window Coupe Blown Aluminum HEMI w/bolt ons (under construction) '69 Chrysler 300 Convertible 375 HP 440 '71 Plymouth Duster 360 W/EFI (Wife's Ride) '12 Ram MegaCab Dually 6.7 Cummins