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I don't know if you compete seriously or not but that advice should only be saved for the noobish daily driver and not for a competitor if that's hell-razor's goal. Let me answer some questions here- The reason why 4 10s was thrown out the window is because hell-razor stated he wanted to compete. 4 10s has MORE cone area than 2 12s, BUT the 4 10 build would have too small of a port for comp use. 2 12s, depending on the 12s, are very close to the same "radiating area" as 4 10s. AQ's HDC3s have an SD of over 550 i believe whereas most other 12s are under 500. Using 2 12s can increase your port area by 150% and the slight loss of cone area would actually give you an increase in pressure when it came to the monsterous port area available. And the quoted statement above- In competition, you want to feed the most power you can possibly feed your subs because these comps, like MECA, restrict you based on fusing. Fuses can take more than rated for quick bursts so it's wise to have a large power bank for your subs, even for those who aren't rich... Phi, a member here, has 2 10" SSDs that is being ran off of a 3,000w amp. It's actually the Audiopipe 3kw amp. I personally tested that amp doing over 1,400w at 6.2ohms on his 2 10" SSDs and they never get hot. So to say it may not be wise to run 1500w on a BL is funny since Hell-Razor's goal is both daily and comp. If he were to choose the BLs, i would suggest running 2kw per BL minimum, 3.5kw recommended for comp. AQ HDC3s - ~2.5kw minimum, 5-6kw recommended. These power recommmendations are all for comp use. The minimum ratings can also be used for daily use as long as your amps are clip free. I'm thinkin about running my DC Level 4s at 3kw per sub daily soon. I'm still tryin to work out the finances on that.

If your looking at running that much power why not look into the SPL line from Mach 5?

high performance station wagons...love em!

found it through the store looking for prices of sundown equipment.

i recently ordered stickers from Fi to a couple months ago....and it did take awhile to get here but...one day i went to the mail box and there they were!! but yea ill bet they will be there soon. just hang in there lol

you have the room to do a box for an 18 and you can even put the box in there and it be loud, i guarantee that... However, massive pressure requires breathing room and an 18 will create massive pressure. To get your money's worth, i'd make sure i had enough room around the box to get the most potential possible. Me, i don't like for things just to work, i like them to work as best as my knowledge will allow them too and my insight tells me that an 18 is just not right for your trunk. I want you to visualize this so you can understand what i am about to say- However many speakers you plan on using on a baffle, see if you have enough room on the baffle for 1 more. If you do not, then you will not have adequate port area for best potential! Next thing is breathing room. On an estimate scale, after doing the above, you must also virtually have enough room on the outside of the box for 1 more speaker for the air to breathe! or some slight overhead room which i'll explain in a minute. so, lets say you face everything toward the rear and you want to run 2 12s. Well, 2 12s is roughly 25" wide, then u gonna need about another 12" of space for port and the rest of the box so lets say box is 37" wide. Well, now you are gonna need aroudn another 12" on the side for breathing room or more... This is a major factor for trunked setups. That's why many competitors suggest 2 10s is the best for trunked setups. I'm not sayin they're right 100% of the time but i spelled it out as to how it works for potential purposes. Look at Thorshammer - he broke a 151 with 2 10s in a trunk.

What sort of comp, what class, is your sole goal to win, what do you mean by daily.... You really are good at asking what product and not so good at stating why we would lean towards anything for you. Size ain't shit, implementation and utilization is.