I think Rob brought up gasket matching the performer because the OP already HAS that intake. So, it would essentially be free vs. dropping $300+ on a new intake.
Gasket matching a Performer wouldn't come close to the performance of a RPM/Air-Gap. You have to consider the entire runner cross-section, contours and overall height. Gasket matching may help flow a little, but in this case it would essentially be like taking a straw and putting a funnel on the end of it. You still have the bottleneck of the straw.
The chart I posted shows gains from 3,400 & up throughout the range in HP and torque, not just peak. That will be felt in the seat as well as on time slips. Off-idle may need extra tuning, but that's where a stick is more forgiving than an auto.
