Intake manifold. Copied Elddebrock performer RPM.

Bobzilla said
Was it down a lot throughout the RPM range or mostly near peak power RPM?

I like that you all chose to keep the extra power on your crate engines instead of using the cheaper intake that is down power.
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Well peak for sure. I honestly don't remember how much it suffered across the board. A junk lawnmower grade air filter can scrub even more. Seen a white paper filter scrub over 50 on a 427 SBF.