E93 BMW Subwoofer Upgrade vs BAVSOUND GHOST Subwoofer

After several searches for the perfect subwoofer to fit in the ski hatch of my BMW E93 convertible I came across the website www.e93subwoofer.com.  This website had exactly what I was looking for to fullfil that need for base without losing my boot or trunk space since I have a convertible.

I search BAVSOUND,ebay.com and other Bimmer Website Post  (http://www.e90post.com/forums/showthread.php?p=19194293#post19194293), but could not find the ultimate BMW E93 subwoofer upgrade that would give me the true deep bass thump that my heart desires.  Until I came across e93subwoofer.com.

E93 Subwoofer