Im concerned about the the tunk specs. I can't think of any prefab boxes that would fit AND give the subs the appropriate VAS. The boxes I build for the e36 trunk are 12 deep, and 16-17 high, 33 wide, and the only way they get close to the reccomended VAS is with polyfill.
<span style='color:gray'><span style='font-family:Courier'>1995 e36 3 Series RIP
1999 e46 3 Series BURN IN HELL
2000 MR-S Roadster= Current</span></span>