the original bass tube is actually a bandpass enclosure. somthing similar to this
its upto you. look at this link and see how you want the subwoofer to perform.
Subwoofer Enclosures
Bro you have already got really good suggestion from Devil bro.. as far as I know Hi-loud shop is the biggest thug i know (Sorry if it meant offensive to anyone) .. If you want a SPL setup then get ready for Kharrr kharr sound from your car.. Get nakamichi comps if you don't want to invest more on front stage.. for rear get pionner 6965V2 speakers.. pioneer 6500f for speakers n comps.. Pioneer 309/310 D4 or S4 and 2 channel or mono amp for powering it.. And don't forget to make a custom box for woofer according to its company specs.
from where i can make custom box
From carpenter. Visit Hall road and there are many of them. Give them the box details and they will make it for you.
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