To ensure reliability, purchase GM part # 12618544 Exhaust Manifold Assembly (W/ 3Way Catalytic Converter). It is sometimes referred to as GM Exhaust Manifold. Directly from GM, genuine parts are superb with regards to quality, longevity, and fit. Every single part passed stringent quality testing, so you can be sure that it's safe, durable, and built to perform like your original parts.
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