N02 is FUNNNNNNN
Just remember. More is better ....= BOOM.
Most kits send the same amount of N02 in for the entire burst (shot). You are increasing cylinder preasure enough to make an extra 75-100 hp at 5k rpms, so.....at 2k rpms, cylinder preasure is going to be off the charts. Dont expect headgaskets to last long if you do that on a regular basis.
Someone mentioned not spraying in 1st gear. I dont understand that, unless the goal in that is to reduce wheel spin. If you are worried about that, get some drag radials, run them at 12 psi when you are at the track. I pulled 1.6 60' times with them on my old car.