I wrapped my EI in foam and put it next to the firewall. My Battery pack is about in the middle of the cabin. I used the Tru Turn 3-1/2" Spinner (Ultimate) which really makes the plane look good. A lot of us with the Rascal 110 are using the [link=http://bennettbuilt.com/page2.htm]B&B Specialties Exhaust Header[/link] which fits really snug to the cowl. A little louder than a regular muffler but not to bad.