I recently bought a 2003 mustang GT with a 5 speed and want to impove performance by a half second in the 1/4 mile. How can I do this without using pulley kits ,superchargers or larger throttle bodies? Can I do this with Hi Flo air filters, synthetic fluids ,better spark plugs and any other lo buck items you can think of ? If this is possible what type of plugs,air filters etc. should I use while keeping stock reliability?                                                                       

gears, cold air, chip and tune.