Hello,
I was wondering if anyone has installed an aftermarket subwoofer to their existing system. JL Audio has a line of subs called the Stealthbox. It is made to fit in the rear cargo area. Blends in and color matching to the interior. I have the fine JBL system in my 03' 4 runner but it lacks low end. The Stealthbox is expensive. I was wondering if this is the way to go to achieving the bass pounding sound that the JBL system is missing.