Just from personal experience, the ERZ product's quality is nowhere near that of Berks. I had Berks installed for a while and wanted to try the ERZ as a possible replacement. When it arrived, the quality was s**t compared to my berks. The welding inside the pipe is a nightmare. There are jagged edges and random welding beads, which will affect the exhaust flow. The flange that meets up with the headers was not perfectly flat. It is slightly convex shaped. If I were to install that on my car, I was sure there would be leaks. So I ended up returning them.
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