Are there any tricks out there to squeeze more top end out of a regular Performer intake manifold? Literature has the Performer producing power through the 5000 rpm range and the Performer RPM to 6500.

a open spacer will give it more high end, but at a loss at low end power. or you can remove a notch about a inch long and about a inch deep from the plenum devider which will give it a little more top end at no low end loss, some guys remove the whole plenum devider which is a mistake if it`s not a high revver.