Replaced left exhaust manifold at 27,000 miles. Replaced right exhaust manifold at 29,000 miles. Now at 30,000 miles the left exhaust manifold need replaced again. Is this typical for this model?
Off hand I would say no. What engine? I have 57,000 miles on my 5.0, runs and performs like new.
Define going bad?
How many total miles? 30,000? 59,000? For a 10 year old truck?
You have aftermarket exhaust system further down the line?