It may affect airflow to a small degree. I got rid of the one on my '01, but at 310 RWHP, I wasn't leaving any performance on the table with it installed or not. I just put a boost gauge fitting in the hole and called it good.
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Tuning, PCM flashing, and burning chips for 7.3s since 2008. Repairing all aspects of 7.3L Powerstrokes for 25 years.
Eight 7.3L PSDs in the driveway including a 1994 Crown Vic and 1973 F100/2002 F350. Looking for the next victim.
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