Bags rule... w00t w00t look at my sig... But what you want is air Cylinders... that is prolly the best thing for your money and you can get a setup for around $500-$600 maybe a little more depending on where you get the stuff and what kinda deal you get... you are looking at about $100-$150ea for the cylinders and then about $60-$100 for fittings and prolly another $100 for lines then you have to get a tank and a compresser if you are going to use just O2 which is what I would do if your not going to be hopin or anything like that... that is about all you would want nitrogen for cause it is faster... then you will prolly want a pressure gauge... that is just a round about number... I am getting a really really good deal on my setup cause I know the own of a local company called "Air Ride" and I am buying most of the stuff from him and the rest I got for the simple trade of a turbo off a 2g eclipse...