It will entre comps but want it for show aswell iv got 2 now just want that next level. I have had a quik look there might have another
I've been to many comps in our area and yet to find someone with 4 12's and have a spare wheel in there wheel well with the whole "showey look" going on. Most people go for the fibre glassed enclosures custom built into the wheel well with subs facing up. The loudest I've seen is 142db out of one of those types of setups. I've seen boot setups with 8 12's doing low 140's.
Are you going to enter comps for the fun of it or to try and win with loudest spl setup? All we have is SPL comps at the moment in WA. Should check out some stuff on
Car Audio & Entertainment.
You could go for those corner boxes with 2 12's then maybe another 2 in a small sealed enclosure with the same volume as those corner boxes facing the rear of the boot and have it removable. I haven't tried it but I wouldn't advise it either. For a drop in box so it is removable to access spare wheel would get pretty tight for 4 12's and very hard to get a "showey look" out of it in my opinion. See what the other boys on here say.
I have seen something like this, 2 ported boxes removable. But to me that does not look good in a car show.