The bolded part is the reason your car is noisy.
Thought that would have been fairly obvious.
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My DC5R is noisey aswell, only hve an aftermarket exhaust but even before it, its loud enuff
Car has no sound deadening (As mentioned above). These are all normal road noises. Drive the car over gravel, you'll think the car is going to fall apart due to all the rocks being flicked up into the guards and underbody.
Its amazing how much noise a simple layer of tar cuts out.