If you want NOS give Lloyd at nemesis a call. Nos is safe and as said is arguably safer on the engine than turbo or supercharger, mainly because it does not put a constant stress on the engine, as your use will be limited to when you can use it in a safe surrounding.
First of you want to decide how much power you want, my recommendation is start of with 25 shot and build up to 75 shot (with a controller). Why you need a controller, because you want the delivery of the nitrous progressive not just to dumped into the engine that amount of BHP into the engine which will cause stress on the pistons, like upping too much boost on a turbo. Also you will want a window switch which will only allow you to release the nitrous after 3500rpms, you really dont want to hit it before as that will cause damage over a long period of time, so a window switch will stop this happening.
Other factors you will want to consider is a bottle warmer which is a blanket which will make sure the nitrous is at the right temp before its released into the engine.
Some people decide to go direct port, which means you will have a jet in each of the cylinder which will give you equal distribution of nitrous within your intakes. This is very expensive to do an unless you are going big power. Single port (which is where one jet is inserted into your delivery pipe) will do, especially for 75 shot. If you want to go 100 shot then you got to be more careful, making sure the right ration of fuel to nitrous is distributed (wet kit only for 350z) you also will want to think of remapping the ECU for 100 shot for optimal performance, I ran 75 BHP and it was fantastic, really unreal power you will have the biggest grin on your face, and no dont believe all the crap your engine will blow, the same will happen if turbo or supercharger if not installed correctly or done properly.
So Basic things to remember:
make sure if going over 50bhp you get a controller
You get a window switch to allow release after 3500rpm
Bottle warmer and dial temp measure
You get it fitted properly single port
Must be wet kit we cannot run dry kit
Have fun..
How long does it last all depends on the size of the bottle you have. Most go for a 10LB bottle. What you got to remember is that you are not going to use all the time, so depends, if for example you were doing 1/4 mile, on one bottle you will probably get over 20 goes Id say, to refill the bottle all differs, its basically laughing gas so if you know a dentist like me you can get a refill between 15 - 20 quid, if you go to a nos supplier they make a huge mark up and charge between 35 - 45 quid.
I cant emphasis enough how good Nemesis were in helping me out, give them a bell, tell em Zedrush sent you, and they will look after you.
If I can help out anymore give me a shout.
P.S anyone says its messes up the engine, really dont know what they are talking about Im afraid.
Before I forget, purge kits.... they look great but they also serve a purpose, they release any excess air in the lines out so nitrous will flow through without being mixed. Not a big deal unless you want again optimum performance. Think of it like a syringe at the doctors. before he injects you with a booster shot he has to push it slightly to get the air out before inserting in you. Only difference is on an engine you just wont get optimum performance, on your body.. you'll get blood poisoning and die lol.
Best Prices Nemesis, I spent over a 1k but I wanted a load of gadgets with it to, but you can pick up installed around 700-800 quid
