it depends one what components you use. Each of those parts you listed has a range of several hundred dollars. Also, it will depend on where you take it for installation.
My gut feeling is you are pushing over 2k for those three things installed.
Headers - installed on jackstands in my garage: Crawford = a LOT of time.
Others will take up to 10 hours - first time & giving yourself a lot of "extra" time.
High Flow Cats - 2 Hours max. (including getting the car up & down)
Plenum - less than an hour (No jack or stands required) :irock:
I'd suggest that you pocket the $'s & do it your self. (at the very least do the plenum & hi-flows)
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