How much should it cost to replace/rebuild a 2000 Porsche Boxster engine?
 

My customers bought a 2000 Boxster of eBay and a week later the engine failed Launch X431 Diagun 3. My customers was just casually driving down the street and a huge cloud of smoke came from my customers engine, some fluids leaked underneath and it won't start.

My customers guess my customers need to take it to the shop. What is this repair going to cost me? Is it cheaper to rebuild or replace? How long does it take?