I had them do it because I don't have the patience to deal with exhaust systems, and the tuning.
So the install costs me a bit more with 5 days of hotel ($300-400 three on the way out, and two on the way back) a $300 R/T air fare, and 3100 miles worth of fuel (3100 miles at an average of 22MPG, fuel at $1.75, fuel cost $250)
But I was pretty much, stress free
The upside is, I got to spend about 40 hours of quality time in my SVT driving there and back.
TB