With your gears, decision to stay with stock headers and only wanting to rev to 5500, NITROUS would be perfect for you, cost about half as much as heads,cam,and intake. Get a 75-150 horse dry shot, put a 190 pump in, a AFPR, ASF32C Motorcraft plugs, sticky tires and that would give you about 1 full second improvement.
Whats with 5500rpm max, this is racin'! bud!
