As far as the NOS sniper brand i dont see much of a diffrence besides maybe a smaller bottle valve honestly.and 5 or 10 pound bottle if you have the room i'd go 10,less fill up's and its there when you need it.your car dont have to be concidered "bottle fed" my cars quick all motor but we still spray it at the track and sometime on the street, that's just another saying for running nitrous so if your cars quick now then the bottle will be fine for getting on it every now and then but once you spray the car a few times you wont ever want to race anyone without it lol Do it