mg zr 1.4 rear speakers and a few problems

So this is my first mg has no engine problems at all apart from exhaust blowing..

I have a few silly problems when im at low revs there seems to be a rattle coming from the back of the car but you can't hear it when your outside the car. The mrs says its comming from the plastic on the boot vibrating and this is a common problem for mgs ?? I had the police following me for 5 miles thinking my exhaust is blowing like crazy there gonna pull me but they never did...

Also the exhaust seems to vibrate / shiver i have looked under the car and there is no holes in the back box or pipe work. So maybe its a rubber thats gone?

When i bought the car the rear speakers was unpulled and there was 4wires just laying in the boot cumming from the rear side speakers anyone know were these go ? Can upload a pic later of the wires there just normal speakers wires 2 for each one they are the normal base ones which comes with every car.

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