Construction seems good but fits a bit. I had to slightly open up the end holes that go over the studs with a dremel tool. Also, the pipe coming out of the manifold didn't allow the gasket to fit (the included gasket or the one I had on the Jeep parts counter), I had to trim the edge with a dremel and tap the gasket with a hammer . After adjustment, the collector was installed and started up normally, there is no leakage. I would say the build quality is comparable to OEM for a fraction of the cost. Time will tell if they hold up.
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