What's up! I am constantly back and forth with my subwoofer design. Has anyone with the Nak system in 99-00 GS400 changed their 10" subwoofer in the rear deck? In a previous forum, I talked about how I changed my subwoofer and custom built a sealed enclosure and mounted it to the rear deck around the subwoofer. The enclosure is .80cuft. I am currently using a Infinity sub. It sounds okay, but I am considering changing to a JL Audio. I recently heard a Kicker Comp 10" in a GS. This kicker subwoofer can be used in infinite baffle design, and that it how it was used in this lexus. It sounded pretty darn good for a free air configuration. Of course I like enclosures because of more power and more accurate bass, but I also love my stock look. If anyone knows about specific subs that work well in free air, I would like to hear your recommendations. I know Infinity has a Kappa model that can be used. JL Audio also has a marine sub that I hear sounds good. Oh yea, I installed a Kenwood mono sub amp that will be pushing whatever sub design I decide to go with.