[DAVID GAGNARD]

I'm certainly not an engineer but I know of real world results..

331 stroker,472hp @ 6400 rpms,no air filter

with a 14 inch diameter X 3 inch tall AC Delco paper filter element,my engine lost 2 hp on the dyno.......

The dyno guy was amazed,he guessed it would have been in the 5 to 10 hp range....we did 3 or 4 pulls with the air filter on and just to make sure,it was the same each time.....

David