ok my b day is friday, and my parents said i have apporximately a 300 dollar limit. i want something for my car, but i dont know what to get. im open to any suggestions, just dont go over 300 dollars. i have intake and exhaust already, i have a GSR engine in my car, i have rims and tires, ive done suspenison, and i really want to put it into my engine, but im still unsure. i want something that could add power or build up or whatever. a header is out of the question b/c im getting ITR 4-1 header and i have to get a custom cat made so it fits, and all that will cost more than 300 dollars. im up for sugeestions. please help.