ever since having my kooks lts with no cats installed my car has absolutely zero drone whatsoever, i also have the borla catback and roto fab cai.......there wasnt too much dfrone before but now there is absolutely zero!!! and it sound like twice the beast it was with just the borla........my brother is in NC and has my camera or i woul;d have posted my videos like 5 days ago...he comes home in two days so i will post videos then