[Drivesthebeast]

If working with a basic-modest budget, try going with an AEM or Injen CAI, Ford Racing 9mm wires and stock plugs, and a FC TB. Go with a MBRP exhaust (or magnaflow if you like them better) if the budget permits (this would likely only give you a more aggressive and louder tone than stock, and no real difference in performance).

I put all of those things onto my stock Zetec, and it runs smooth, is very responsive to throttle inputs, and the car IS faster or peppier than it was without those things.

Also, I'd reccomend replacing the gearbox oil, and change the tranny oil more often than required (like every 2500-3000km's like I do)...the engine will be a happy camper...