yea, always depends on the car. you see, i'm planning on either a hood intake or a fender intake. i have a carburator engine, which means i have the big ass round air filter, opposed to the newer cars with the small cone filters. having this type of filter, i dont need any filter at the end of the piping. - which ultimately means i can get more air suction through the piping.
i dont think i can get 30 extra horse, but i think i can get 20. my car is about 2000 lbs or less, and with a smaller engine, any modding is highly effective.