Did you try a doorman exhaust manifold?
The engine should not torque in the mount. If you note the engine moving when you rev it replace the mounts. This has likely helped to cause the manifold cracking.
Well a couple hours later....
New motor mounts and manifold. We'll see how long this one lasts, thank goodness for lifetime warranty parts!
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I spoke with a exhaust manufacturer. They really felt too much motor movement and/or to rigid of an exhaust leads to cracked headers or loose flanges. So now that you tightened up the motor movement be sure the exhaust can move with the motor.
Yeah, I lovin this trip so far. Found a lttle dirt road off the pavement that lead down to the water.
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