I will play devils advocate here was well.
A 50 shot of nitrous on a 4,ooolb truck is like tryin to bang a NY City hooker . You wont feel a thing.
I had a dodge neon R/T with a 75shot. This thing kicked ass. It was the venom computer DRY kit. After having this kit, I am firm believer you can stick nitrous on anything. It jus takes some research. FIrst I got a MSD DIS II box and retarded the timing and then went 1 step colder on the plugs as well. I had a nitrous cam installed along with bigger TB, ported intake manifold, ported heads to match and the exhaust to match up as well. I tried a 25 shot first, never felt a thing, then 50shot, felt a lil , but the 75 did the trick, this was in a full loaded car that weighed 2400lbs with me in it. I did put the car on the dyno and seen how the venom kit really worked. THe A/F actually richened up as I sprayed nitrous, so I know the kit was working , etc.
Anyways. The problem with nitrous like others have stated is, it costs you money all the time. along with your time of taking bottle in , etc. Its fun til the bottle runs dry. There are risks with it. I tried to eliminate all risks, but I did have an incident of intake back fire. I had the intake manifold smoothed out, they took the bumps out and rewelded to increase air flow. Well when the Nitrous backfired while I was purging system on the street it broke the welds (cue the cheesy Fast and furious music. lol) But it did happen and then the car ran like at 2000rpm from the horrendous vacuum leak this caused. I limped home and got it squared away, etc. But **** happens.
Personally, Id build the motor up, Itll last longer and you wont have to worry about filling bottles or wonder when they will run dry.
Dont get me wrong, I spanked many many mustangs in my lil neon, but once the bottle went dry, I was nothing more. lol.