Air filter Laboratory Tests per ISO 5011: Minimum efficiency of 99.9% contaminant removal. (Based on Wix 46664, Wix 42803, Wix 46761, Wix 46433 ). The engine types may include 5.3L 5328CC 325Cu. V8 FLEX OHV Naturally Aspirated,5.3L 5328CC 32 5Cu.
Wix filters are the best non-reusable filter you can buy. Don't ever buy some cheap substitute just to save a couple bucks. Protect you engine and get the real thing.