If we look at it this way, the 130hp Zetec is only producing around 100hp at the wheels. Let's say start with that and you have intake, race header, exhaust, plugs, ECU, etc. all the basic mods for a car. They cost around 2000-2500 including installing. Next up, the moderate step, which is the engine internal, pistons, rods, cams, crank, valve springs, valves, etc. Just to rebuild it, it's around 5k-6k including installing, then you have port and polish, at least for 1000, now comes to the advance part, which is striping, changing the parts to fiber glass, they are not cheap, and my friend, they take long time to install. All the stuff plus labor plus custom made-to-go parts, I think 20k sounds about right, with no Force Induction, NOS, plain N/A. And IMHO, the mods above should give a car a steady, consistent minimum of low 13's.
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Mods: FocusSport Cool-Flo, spark plug wires, cat-back exhaust, JBA header, Esslinger intake and exhaust camshafts, cam gears, AEM underdrive pulley, Kent timing belt, ported/polished cylinder heads, MSD DIS-2 ignition, Superchips performance chip, H&R coilovers, Eibach sway bar kit, Energy suspension bushings, FocusSport front upper stress bar, Team Dynamics Motorsport 18" white wheels, BFGoodridge Scorcher tires, PowerStop cross-drilled rotors, EBC brake pads, APC Indiglo guage, APC M3 style mirrors, Autometer guages, 3A racing pedals.
Upcoming mods after winter is over: Aerocharger Stage 2 turbo kit, APEXi twin-chamber Blow Off Valve, AutoMeter Boost Guage.
Ice: Blaupunkt Neveda 168 head, speakers, and dual 12" subwoofers.