Crutchfield still has the JL Audio custom fit subs available. Kinda pricey, but worth it if you want a stealth install and want to retain full use of your rear cargo space! I had one in the past and loved it. Just ordered one for the new (to me) 4.6is!

https://www.crutchfield.com/p_136942...tealthbox.html

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"Asphalt is evil...it must be punished!"

85 M635, 89 Z1, 90 Z1, 91 850, 02 4.6is, 03 M3 Cabrio, 17 30-Jahre M3