im a few days away from being the proud owner of a bone stock 2004 mustang cobra with 12,000 miles. im planning on upgrading the stock supercharger to the kenne bell when i save up enough. the first things ill do to the car is put a new exhaust system, put a k&n in it, after this im stuck. i know there must be more i can do to it to increase the horsepower. i need some guidance on what to do. ive been reading around and ive noticed people talking about pulley changes.
get a different pulley. a 3.1 inch pulley will inrease boost 1-2 psi and a 2.81 inch pulley will increase boost 4-5 psi. This will work nicely with the upgraded exhaust. They cost about $80 depending where you buy them. remember to get a pulley puller though.
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1988 red GT AOD. Mods: Ported GT40P Heads, 3-Angle Valve Job, E303 Cam, Edlebrock Performer 5.0 Intake, 65mm BBK EGR, Professional Products 65mm TB, MAC CAI, 80mm MAF, 24lb Injectors, 255lph Federal Mogul Fuel H.O. Fuel Pump, BBK Shorties, O/R H-pipe, Flowmasters, Dumps, Timing-16*, Shift kit, 4.10 gear, Sub-frames, Aluminum racing radiator, B&M Trans cooler, Pro-Form Upper and Lower Control Arms, Energy Suspension Urethane Suspension Components Recent: MSD 6AL Ignition, Battery Relocation
Pulley, cat back, cold air intake and a TUNE. An absolute MUST at that point. Can't just ad 4 pounds of boost and not retune, or at least check AFR on the dyno. Then the infamous 03-04 Cobra wheel hop will start. Will talk about that later.
increase horsepower on bone stock 2004 cobra? 
