yeah this question is probably asked a hundred times but i dont really feel like looking threw thousands of threads on this website...im 16, i know a decent amount about cars for being as young as i am, but anyways. i have my 2000 5spd mustang with dual flowmasters, and an ebay intake.. but i want more, but have no clue what to do...i have seriously spent hundreds of hours looking online to purchase something for my car but just dont know what to get.. i was thinking of buying some 4-2-1 long headers, tri-ax short throw shifter, underdrive pulley kit, and 9mm spark plug wires with like NGK plugs but was wondering how much hp i would get with all that? and any other tricks or tips i can do to my car without spending a lot of money on my car?or other things u would suggest to buy for my car??