To ensure reliability, purchase GM part # 12638135 Pump Assembly, Secondary Air Injection (W/ Bracket). It is sometimes referred to as GM Secondary Air Injection Pump. 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 Cadillac ATS, CTS models.
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