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I read in a thread on here before someone who had got some sort of insulation/ sound proofing stuff from b&q I believe and lined his boot floor, rear doorcards with the stuff to reduce rattles and stop the road noise. Can't find it for the life of me now though!
Im not to worried about the rattles as its pretty ok for that.
Just want to reduce the drone exhaust on motorways etc,i did think of using a thick Rubber matting to,to maybe use and have that under the boot floor and rear seats.
I can see what your saying but i want to keep the stealth look,so think i will cut the angle of the tailpipe to aim the gases outwards rather than downwards & bouncing back up under the car to cause the drone noise on motorways.Hopefully this will help a bit with a thick rubber matt on the boot floor.
This sort of material is ideal , it is heavy though. Try and get the thickest you can. I have a yozza exhaust and use my standard boot mat , a layer of electrical safety mat and the sound is reduced a lot.