Also you want to check the screen before your solenoids to see if it is clogged up. If the shop that you have your bottle filled buy hasen't cleaned they set up in a while it will get that screen (if you are running one ) dirty. If it is dirty all you have to do is take some brake parts cleaner and blow it in there. Let it dry all the way before putting it back in your car. My screen was all clogged up from crappy nitrous and I had no pull at al. I was totaly shocked when that was the only problem with my system.