Exhaust and road noise come right through it, I can't say how much more because I have not run a car with a stock hatch with the engine and exhaust I have on the car. I just have to worry about being under 103db so my car is very loud.
I don't run a hatch seal(weighs too much!) so I get water in the car. I suppose you could run one and I could seal up the window to hatch mating surface when I build it but its really a pure race part. I would really have to take a look at how close the frame is to the chassis on the underside to see if a stock seal would help. Its made to look like a stock piece from the outside only so its held only by the dzus tabs not resting on the body opening.
For use on the street, its possible, where there is a will, there is a way. If you want to lose a bunch of weight of your street car I can help you brainstorm to make it work for you.
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New rat from the sinking ship.
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