Hey JMH,
Does the W6V2 have enough air space? The specs is .9 to 1.50 cu. ft for a sealed box. I want to do exactly what you have done. I printed your pictures out to try to get a quote on how much it would cost for it to be done in my X5, I got quoted around $800. If you don't mind, how much did you pay for yours? I had a kicker 12 L7 and competed in a db competition and hit 148.9. But I love JL, I'm going to power the sub with a 500/1.