I had mine broken too. Took it to Ford Dealership and they replaced the manifold and three studs. One stud couldnt be removed and they put a commercial grade, extra heat resistant silicone over the badly rusted stud. total bill was about $600.
2001 Ford Expedition XLT 4x2
Pathfinder Luxury SUV tires
Monroe Monromatics Plus shocks x4
Rear air ride