Review on π Dorman 674-549 Exhaust Manifold: An Ideal Fit for Nissan Models by Tim Ram
Bad Casting! Complete garbage!
I went through two of these in about a year. The latter cracked in less than 1000 miles. They appear due to poor watering. You can see that the metal looks crystallized along the crack after cleavage. Cheap steel and bad castings make very bad components. Save your money, this exhaust manifold won't last a month!
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