To ensure reliability, purchase GM part # 19418950 MANIFOLD ASM,EXH (W/ 3WAY CTLTC CONV)"KIT". It is sometimes referred to as Hummer Catalytic Converter, Hummer 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. This part fits specific Hummer H3 models.
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