I havent noticed any difference in the system. However you need to know that less insulation means more internal noise, and some of us might equate that with a downgrading of the sound system. I purchased covers for the storage areas and a rear deck carpet to lower the inside noise. I am seriously thinking about some spray on sound insulation underneath the car in the area of the wheel wells. But like anything esle only time will tell if we go there.
Hope to Z you soon
MYellow Z06, K40 stealth w/laser difusser front and rear, 3m clear bra, CF shift knob, storage covers, and rear deck carpet(to lower the volume inside)