This is the ultimate subwoofer system for the Ferrari 355. These enclosures hold either three (F1) or four (6-speed) monstrous JL Audio 6W3v3 subwoofers. JL Audio makes the only "true" 6 1/2" subwoofer. These are CNC manufactured for a perfect fit. Secured to the firewall in the same manner as the Ferrari OEM "Hi-Fi" optioned subwoofer enclosure for the 430 and 360 models. Wrapped in gorgeous OEM Ferrari leather and stitching.