Done the foaming.

It does reduce the road noise.
Let me give you some pictures, you have the road noise of 60kmph @ the actual speed of 110kmph.
You have the road noise of 110kmph @ the actual speed of 160kmph.

The stock soundproofing for my car was quite good (continental car).
i did the aftermarket soundproofing for my car too, 2 layers at the floor and 3 layers at all doors.

The foaming still cuts down the noise nevertheless.
I don't encounter "roller-coaster ride" or "bumpy ride' after foaming.
I was cruising all the way from KL to JB @ 180kmph last night. I enjoyed the ride.
Money well spent and thumbs up for Kevin.

This post has been edited by ALeUNe: Sep 18 2011, 06:19 PM