Here's a you tube video of it
https://www.youtube.com/watch?v=73rpa9Tg7TEstarted very faint about 2,000 miles ago and has progressivilly gotten louder
car has 85,000 hard miles on it been running the LMS 93+ tune since 10,000 miles
much spirited driving and mutiple 1/4mi track passes 13.4 best time
Tires have about 7,000 miles no odd ware patterens
had the alignment checked today all good
sound starts from a roll and gets louder the faster you drive
sounds like its coming from all 4 cornners
rear dif fluid never changed
PTU unit fluid never changed
Has anyone else expierenced this ?