In reality I believe the setup added about 40-50 lbs or so to the rear. The box, amps and speaker probably weigh 70-80 lbs. However, I removed the spare tire, jack, lug wrench and associated insulation and fiberboard. I estimate that stuff to be at least 30-40 lbs. At least the weight is in the rear, where you want it.
If I'm not mistaken 50 lbs should equal 1/2 of a tenth of a second in the 1/4. Not a big deal to me, but that 1/2 of a tenth may be more important to others.
Here are pictures of my enclosed Q-Forms. They used Vifa PL18 4ohms with a cut down frame to make them fit in a 5 1/4" mount. I ran these in my 94 Cobra along with a MTX Thunderform. You can see and read more about them by searching this forum for a thread called "This old Q-Form". I no longer have this car but still have the Q-forms and Thunderform.
I like that car-puter. I'm thinking about doing one for the car I have now.
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