I drive a 2005 BMW 645ci, and I'm looking to make some performance mods. I've heard chips can give me more HP and torque but I don't want something that will be self operated and sitting in my car, I'd like it to be under the hood. Im only 16 and although im really into cars I don't have much experience or knowledge in how to modify them. Could anyone tell me what modifications I could make by adding a chip or anything else? Im looking to spend about 1000$ on everything performance, and to get as much bang for my buck as I can!