welcome to the world of mustangs...
you were looking at the K&N and pullies, that's a great start. Also the Bassaini (forgive the spelling) X pipe with a set of mufflers (your choice for sound: although im only like 25~30 minute's from your house, you can hear what my buddies 93 GT with no cats and MAC muffler's sounds like. Next I would spend the money on a gear 3.73 should be fine, 4.10's better. A torque converter, and a shift kit (these last two will give you more seat of the pants feel than anything your talking about bolting on.) A good place to check out when your ready to buy is Street Stuff in Addison @ 630-832-3773. Ask for Grant.
You have to remember things Subframes (put these on first) a rear suspension system (upper and lower control arms) a good tune up with new plugs, wires, and a new cap-n-rotor, fuel filter.
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