At 80mph plus, the cabin drone from the Type R along with the turbo and engine sound is loud but not annoying. I like it. At high speeds, I hear/feel a cool short buzz sound during up shifts from the Type R. It's very nice.
Yes, I covered and zip tied the valve sensor underneath where it cannot get wet. The angle of the muffler making it look low is by design to show off the nice bluing of the titanium. Its lowest point is the same level as the lowest point of the differential fins. Type R fitment is perfect...