Mal,
that included runners - I bolted a plate across each intake face .
On the street the intake seemed fine - at the track a different story . Killed the 60' but ran same mph. On the dyno made similar power to the M1 single plane I was running at the time . Could not get it to richen up enough . I have since put better flowing heads that woke up the motor but have not retried the modman .Maybe next season

Tex