No the cheapest way is to do the $1500 Vortech S trim.
Add $600 on top of that for a dyno tune so you don't blow up your motor. Also will not be nearly as effective if you don't have all the other bolt on supporting mods done OR the proper suspension/tires to get the power to the ground.
2000 Mustang GT Steeda build #48. Bolt ons, suspension, Novi 2000.
Just because I give you advice, doesn't mean I know more than you. Its just means I've done more stupid ****.