so i have a 2005 3.4L impala...how big of a nas kit can i put in it...can i shoot somewhere around 100 to 125 or should i do less??? how big can i go

that depends on how long you want you motor to last. the more you use the faster it will burn out your piston rings and do other internat damage. if you want to use it for racing then i would go mabye 50 but no more or you motor wont last long.

It's called Nitrous Oxide not nos, nawz, nas, or anything else.

I would say 50 at the most. You want a wet system though.