To ensure reliability, purchase GM part # 20873448 Shield Assembly, Catalytic Converter Heat. It is sometimes referred to as Hummer Exhaust Heat Shield. 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, H3T models.
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