side or rear firing. not forward firing port. You need to load off a solid wall if you want any results. Front firing only works if you completely wall off your vehicle. Up firing port only works if the port is close to the roof.
NEVER EVER touch hifonics garbage. I'd go audiopipe over hifonics anyday, but its just better to save up for a proper amp. Look into an orion XTR 2500.1 on
ebay, should be more power than the sundown scv for same amount of money.
For the sub if you want SQ, i'd stay away from the X its horrible with upper bass notes and box picky. Just basically a low note oriented woofer more than anything. The guys that recommend it to you mainly just play bass modified music rather than a wide genre of unmodified music.
look for SSA Xcon or Icon instead if you listen to anything other than rap. It'll still play low notes very close to the Xs but it will perform massively better with everything else you throw at it as well, a lot more bandwidth, a lot less enclosure picky. Why is this? Traditional surround plus aluminium shorting rings. clear inherent differences in subwoofer design that allows it to blend into the midbass region a lot more which is required if you want a nice sound quality balance rather than just low note booms and nothing in between. Sundown fanboys are not really into anything Sound quality so they would not understand the significance of this. However if you dont care about any of that then you can stick with the Xv2
However the SSA subs have a 1-3 month build time depending on how busy they are which they always are busy so more like 2-3 reason is because its made in America. China (sundown) would mean you get it within one or 2 weeks tops.