Alright guys so hopefully someone can help me, I know some about 4th orders but I have a friend here that wants one done for his 2 Sundown X-12s. Now i understand the ratios but my question is if i need 5ft3 which is recommended for ported. Now if I do like 2:1 ratio that means i do 5ft3 ported and 2.5ft3 sealed correct? Just wanna make sure I don't screw up this ya know. And if that is correct then I do the ported section exactly like a normal ported box? If anyone would help that would be awesome! Thanks!