i have got a DOHC 2.0 8v EFI engine sat here that i am going to be rebuilding for my car soon.

i want to add a nitrous system to it but to be honest i do not have a clue when it comes to this stuff.

what sort of setup would you recommend to give a good increase in power i am looking for a 15-20bhp increase or there abouts and i want it to activate at maximum throttle but still be on an arming switch.

also is there and precautions i have to take with the engine before i start putting nitrous through it.

cheers