Ok I went to a loca car audio place yesterday to find out how much it would cost to get a custom box built for my 12" JL W3-d4 (already have it just not installed) and he told me that they do a freeair setup with just a board custom fit across the back for $100. I have heard nothing but bad things about freeair setups so I was really skeptical about it. Then he tells me that it would cost about $275 for a box for just one of them.
So my options are this:
1. use the setup that I have now w/ 1 JL audio w3 and the alpine mrv-t501 and have an expensive box made
2. buy another w3 and another amp to run both of the subs and do the freeair setup
I know that the second option will cost a lot more but it should also sound so much better
How much would I need to spend to get a decent amp to power those 2 12s? What is everyone's opinion on this freeair setup?

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Jay

black 85 Z28, t-tops, 4bbl carb, flowmaster 80 series muffler w/ custom tips (hollowed out cat), edelbrock chrome air cleaner, B&M Megashifter Infinity 4" 2 way front speakers and Infinity 3 way 6x9s, Alpine CDA-7863 head unit. MacEwan motorsports white gauge overlays, blue Xenon bulbs. many more mods planned (350 4 bolt main w/ holley 4160 and edelbrock performer RPM intake coming very soon)
Jay's webpage
No car with 4 doors is a sports car! this goes back to my friend comparing his Maxima to a Camaro