How much????

There are several potential problems resulting from a poorly designed exhaust manifold used on motor homes. The manifold on trucks is different and not interchangeable. The design to allow normal expansion and contraction from heating and cooling was flawed. The result is cracked manifolds, broken exhaust bolts, and cracked cylinder heads. You may encounter any combination of the three. The price you have been quoted, $1,600.00, seems a bit high. I had mine done at an independent shop for $1,000.00, which seemed high until I watched the technician bending over the motor under the bed drilling out broken bolts. It was very labor intensive with disastrous potential. Trying it yourself, you maybe lucky to find it is just a broken manifold. However, if you get stuck removing broken bolts your only option is to have the motor home towed to a shop. I am glad I paid to have it done professionally. Bob
PS There are aftermarket manifolds designed with a "slip" connection in the center that fix the design flaw