4 apline type r's

[82 cutlass 10+ year member]

If you don't mind cutting some metal around the rear seat going into the trunk you will get some more room for a wider and taller box . You should be able to get enough room for a ported box . Build 2 boxes 36 x 14 x 14 . Port 12.5 x 3 x 26 . Tuned to 35 hz. That will be 1.25 ea. ported