If the work was done by a reputable shop, it's hard to beat the price on someone else's build... Though I always wonder(worry?) why folks sink a bunch of time/cash into a build and then sell the car like 5 seconds after its finally finished. I love my TT Z so much you'd have to pry it from my cold, dead hands.
My suggestion:
Can you do the work yourself?
Then boost your Z - a lot of the investment is tied up in the labor costs and you will know the installation better than anyone.
Would you farm out a boosted build?
Buy a car that was built by a reputable shop and has documentation, and take some of that savings and have a reputable shop go through the install and tune with a fine toothed comb to make sure everything is in good shape.
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