I just ordered the Nitrous kit from NX(NitrousExpress) a few days ago and am really excited. I've never used NO2 on a vehicle before. A close friend of mine told me to go with no more than a 50 shot because of stock internals. I have all the bolt-ons for my car so I'm just going to use the 50 shot. When my cams from JWT come, at the track I might upgrade the injectors to a 75(only at the track, not on the street). I'm not planning on using it that much because this car is my daily driver and I wouldn't want anything to happen. Nitrous experts PM and tell me what you think.