The turbocharger is the heart of your engine’s breathing—and for the Cummins QSB4.5-173 (2015–2022), using the correct OEM 5321671RX turbo assembly ensures that heart functions optimally. This isn’t just about boosting airflow; it’s about preserving engine balance, emissions compliance, and longevity. A mismatched or worn turbo can lead to lag, smoke, poor fuel economy, and costly repairs down the road.
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Designed specifically for the QSB4.5-173’s airflow and pressure needs, delivering the right boost curve 
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Maintains proper compressor and turbine tolerances to avoid surge, stall, or excessive backpressure 
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Helps curb black smoke, exhaust temperature spikes, and turbo lag that arise from degraded or incorrect units 
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Built to OEM specs (5321671RX / 5321671NX / related cross numbers) for reliable fitment and compatibility 
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Supports emissions compliance by enabling precise combustion, mitigating unburned fuel or soot 
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Fully balanced and tested to reduce vibration, wear, and premature failure 
Your turbo is doing critical work every second your engine runs. Installing the correct OEM 5321671RX turbo assembly restores your engine’s breathing efficiency, protects your aftertreatment system, and keeps your QSB4.5-173 running strong and clean—not just today, but for the long haul.





 
 




































































































