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I thought the main reason was because the original stock filter housing had a defect that increased the possibility of not sealing. People went with a Tymar because the AIS did not exist.
And today, they both exist. AIS and Tymar filter near equal, and the Tymar/Donaldson filter setup is $$$ cheaper.
The other benefits were lowering EGT's if you tow heavy, or need more airflow for a high performance engine.
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2000 F-250 7.3L Powerstroke. Build date 08/99.
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