I'm to cheap to do that While my son was answering the door and children were screaming on the street I run my late and in not long time I made my own piece. I used derlin (lighter and cheaper than aluminium) as I did not have such big aluminium rod laying around. On the picture below you can see it already mounted on the plane. On the second picture you can see a a vent cover that is facing the firewall. I will modify this if velocity stack doesn't help.