I was refering to the 4366 with the D466 engine that was not up to pulling unless you turned it up and then the manifold was the first thing that gave out. I didn't turn them up, other dealers did and then I had the pleasure of working on them. The 4386 had the intercooler so it was able to much better take the added horsepower. Same thing can happen to the 2+2 if you turn it up and weight it down to hold it .
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