s4 motor in an 2001 audi a4
#2
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Unless you have a donor S4 onhand for all the little electrical stuff, you'll see it isn't worth the time or money. it would basically be cheaper just to sell your car and buy an S4.
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#10
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Usually it's "if you have to ask, you can't afford it." In this case... if you have to ask, it's way beyond your skill set. With all the inherent complexity - if you have to ask where to get an engine, you're way out of your depth already.