a friend just gave me a 19% pulley and i was wondering what kind of gain do u see out of the pulley and does the car need any other mods to be reliable rite now all my car has is atla intake thanks for the help in advance

 

You will be fine with just the 19%(you'll need a different belt of course). You'll have better gains/overall improvement though if you also go with software(like giac) and bigger injectors (380cc). enjoy the pulley, its where the fun starts!