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Will a 2006 Ford Mustang 4.6 L V8 engine fit into 1999 3.8 V6 Mustang?

No, a 2006 Mustang 4.6L V8 will not fit directly into a 1999 Mustang 3.8L V6 without significant modifications. While both are Mustangs, the chassis and engine bay are different enough to present major obstacles. You'd need to address things like:

* Engine Mounts: The 4.6L V8 engine mounts are in different locations than the 3.8L V6. New custom mounts would be required.

* Transmission: The transmissions are incompatible. You'd need a transmission from a 4.6L Mustang, along with the associated drivetrain components.

* Wiring Harness: The wiring harness for the 4.6L is different and will not work with the 1999's system. A complete harness swap or extensive rewiring would be necessary.

* Exhaust System: The exhaust system from the 4.6L won't fit the 1999's chassis. A custom exhaust system would be needed.

* Cooling System: The cooling system may require significant modification or replacement due to the larger engine.

* Computer/ECU: The 4.6L's engine control unit (ECU) is incompatible.

In short, while *theoretically* possible with extensive fabrication and engineering skills, it's a massive undertaking far beyond a simple engine swap. The cost and effort involved would likely exceed the value of the resulting car. It's much more practical and cost-effective to find a 1999-2004 Mustang that already has the 4.6L V8.