well as im moving away from street b i would be happy to share with you everything i can about a trunk car.
this is an idea of something i have tried....
the 1st pic is of my slot ported box
148.xx with this setup
next up is the box i used for 04 finals.... 149.xx with that ..... then moved up on the subs and power (shocker 02 sigs and 4 1200d's) and goto 151.3db
then i ripped that box out and built inside the trunk... upgraded to neo sigs ran a crap ton of wire and really figured out the amps to make the give the most power before smoke.
did a 153.0 at world finals.
that sadest part of that is after looking all over my hard drive i was so worried about hiding my design i dont have ONE pic of it.
im sure someone out there has a freaking pic... if so please post it.
the box looked just the same as above but was all wrapped in black vynal as is the rear deck now.
i used PVC tubes (the 12" green ones) and and we made them as long as possable then started cutting off .75" at a time till we got closer then went to .5" at a time.
we also used 3" fiberglass 45's in the conors and on the top and bottom of the box ion the back wall.
everything was double layer .75 but the bottom plate as it was screwed right to the car floor.
i then added a 2x4 across the top to help with flexing.
the whole box had a fiberglass panel molded around it then covered with black vynal.
now im not sure how much this will help you but its an idea.
i tore this box out went i went to another state to move so i cant take pics now ...., but i still have the tubes and i started to rebuild the box before i decided to change classes and go another route.
i could take a pic if you need to see it better.... let me know any questions please ask.