[mr0077]

Ernie, FWIW, in Houston one dyno day I did two back to back runs, one with and one without the paper elements I run (I don't care for the K&Ns), and I got a 7.82 HP and a 8.34 lb-ft difference with and without...no jetting change, but A/F ratio was 12.30 at peak power with the filters on, and 12.25 without. This was on a mild (400 wheel HP) sideoiler with a slight overbore...makes me think it isn't worth the possible damage to the motor to run without a decent filter. Oh, yeah, they were dual 600 CFM carbs also.