none of them as i know..btw, somebody mention before getting those Van rubber door lining to add to our car(double layered)..and the wind noise will be reduce...but door are harder to close...

thanks for the reply. shall research on that now. so determined to get rid of that sound.

Any comment on this product? http://www.lelong.com.my/Auc/List/2007-02DSale4946173.htm

quite good offer
even if it's not thick enuf, can stick 2 layer

but haven heard about that brand b4 thou

last time my boot lid is shaking when my subwoofers are firing.
after put superlon, no more boot vibrate.
so i think superlon is good for reducing low frequency sound aka vibration.
but if your purpose is to reduce external noise, my opinion is dont waste your time & money

if to reduce external noise? any options?

Maybe this products can help:
- Dynamat Extreme
- Deadspan
- Dampit
- Raamat