I took the car on a 40 mile run. This "new" 542C filter seems to flow better than the later issue AC Delco it replaced. The air temp was 60 degrees, but it seemed to pick up some high end power, and I can now hear the secondaries through the unmodified intake system.
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1976 LeMans B09 Freeway Enforcer, 455/M40 Smokey
1977 Trans Am, 400/M21 Black/Gold Bandit. 44K actual miles
2017 Sierra SLT 1500 Z71 4X4 
2019 Canyon SLT Crew 4X4 
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