My prelude moved more air on less power than my toaster does with more sub and power.
The Prelude was rounded somewhat like your civic, while my toaster is long thin with straight panels.
Rounded objects are way stronger that flat like a lightbul, egg or even the windshield
I am thinking the strength from being rounded would mostly be from the outside of the curve and not inside...
I need a H/O alt for my 2006.5 Scion xB
Sold to: Jonesy
Traded with: Jonesy, 310w6, Ciaonzo
Bought from: newtitan. T3audioNavi