Intake- K&N, BBk, MAC
Gears- 4.10 Ford MOtorsports. www.gefracing.com
There are many intakes out there, BBK and MAC are the shiny chrome ones that go into the fenderwall, the K&N FIPK is the one that exposes the air filter and is placed right under the hood. Both give pretty good results.
Exhaust, now you can choose many differen't brands, lots of people here have magnaflows and lots of flowmasters. Flows are pretty popular, they sound pretty good, but that have bad drone, you may like it you may not like it. They are also not good at all for supercahrged or high powered engines. Magnaflows are strait through mufflers, they sound very nice and are the perfect muffler for supercharged engines and such. It depends on what kind of sound you want, flows give you that raspy growly sound while magnaflows give you that smooth throaty sound. I personaly run magnaflows and love em.
Gears, they are the best bang for the buck! 4.10 gears are perfect, you will love em! Get Ford gears, they are the best. Gef racing sells them for 139.99 i believe which is the best price i've seen. Gears though, unless you are a highly trained mechanic, you wont be able to put in. They take very special tools and is about a 8 hour job. Most shops charge anywhere from 250- 600 dollars. I dont really know, i had a mechanic friend of my dads come over to my dads house and we installed them. Let me tell you, its pretty hard.. Getting it all out is easy, getting it together and setting the backlash and pinion depth is the hard part.
I hope this helps..