e-brake or jumper valve


is any body still using the e-brake to hold the car when launching? what are the pros and cons between e-braking and using the jumper valve setup being discussed in other forums to hold the car
i use the ebrake to go higher than 4 psi, i dont recommend it though, it can bend backing plates on the rear wheels....i have no idea what this jumper you are referring to is...

man i tried the ebrake and i almost rolled through the line.....i use the good ole red face technique which is push the brakes down till your face turns red then build boost....i launched at 14 psi doing this and netted a 1.6 60 foot.