Is this site trustworthy? Fi BL15 Sub Box Design!

I came across this online today and I've been looking for box plans. This let me put all of my driver specs and the size that I need the box, the cu ft for the box and the frequency for the box. I am getting a Fi BL15 and I'm thinking 3.8 cu ft and 32 hz. This is the box that the site gave me. I am a little concerned about sound quality. I listen to a lot of rock and rap. My main concern is that I want my car to really shake, and I want to be able to FEEL the bass.

http://www.subwoofertools.com/calculator_display.ashx?size_id=15&driver_qts=0.4&driver_vas=2.51&driver_fs=34.5&driver_xmax=21&driver_displacement=100&driver_count=1&enclosure_width=36&enclosure_height=22&vb=4&fb=32&sheet_size=0

Would that be a good box?

The only other thing I would do is extend the top and bottom by .75 for some over lap and use double thickness on the front. What do you guys think?

 
I came across this online today and I've been looking for box plans. This let me put all of my driver specs and the size that I need the box, the cu ft for the box and the frequency for the box. I am getting a Fi BL15 and I'm thinking 3.8 cu ft and 32 hz. This is the box that the site gave me. I am a little concerned about sound quality. I listen to a lot of rock and rap. My main concern is that I want my car to really shake, and I want to be able to FEEL the bass.
http://www.subwoofertools.com/calculator_display.ashx?size_id=15&driver_qts=0.4&driver_vas=2.51&driver_fs=34.5&driver_xmax=21&driver_displacement=100&driver_count=1&enclosure_width=36&enclosure_height=22&vb=4&fb=32&sheet_size=0

Would that be a good box?

The only other thing I would do is extend the top and bottom by .75 for some over lap and use double thickness on the front. What do you guys think?
Im getting the same sub and building a box pm me maybe we can figure something out

 
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