To elaborate, he means Heads/Cam/Intake
A good intake (trickflow/edelbrock, even GT40) will wake the car up, match that with heads (AFR! ) and a decent cam, as well as a set of headers (good shorties, or long tubes, depending on your budget/application) and you will have one quick 5.0
With mustangs you have a LOT of options you just need to decide which route to go.. The roundabout way of building the car up one step at a time (taking it apart each time) or go all out and transform it into a beast..
2012 IS F Blue IS F Sport
2006 Mustang V6 wannabe