ITRCA

I know it is possible to shift without using the clutch if you do it at exactly the right time. what I don't know is, is it feasible for dragracing or racing in general, is it slower or faster than shifting with the clutch?

My GSR has no special upgrades and has a 1/4 mile time in the mid 14's.
Based on experience how much would my time improve with say a 65 shot worth of NOS.

If I wanted to do shoot more than 65 are there any upgrades I would have to make?

From what I have heard NOS is the cheapest and most effiecient way to and boost to a car. IF anyone has any experience I was thinking of installing a system in my 2000 gs-r. Is it difficult?