2002 with Mark Levinson audio. I replaced the blown factory sub with a Dayton Audio 8” 8ohm dual voice coil sub today. I'll put more details and advice in the comments for
2005-2006 Lexus LS430 Mark Levinson COMPLETE System Speaker Repair Kit FSK- LS430-2005
LEXUS LS430 MARK LEVINSON SPEAKER SUBWOOFER 86160-0W260 861600W260 for sale online | eBay
Mark levinson subwoofer regeneration LS430 - YouTube
Mark Levinson Subwoofer - LS430 - ClubLexus - Lexus Forum Discussion
2000-2005 Lexus GS430 Mark Levinson COMPLETE System Speaker Repair Kit FSK-GS430
Lexus OEM Rear Subwoofer Speaker Mark Levinson 2001-2006 Ls430 for sale online | eBay