Dynamatted hatch and doors. Installed 2" foam in hatch. Replaced Yoko tires with Pilot Super Sports. Noise is down about 6 dB. Still sounds gravely on smooth asphalt and harsher sounding on grooved concrete slabs.
I checked the firewall and there is factory 3/8" pad that goes under seats.
I think some the noise is coming through door seals (they are good and tight).
Too bad more can be done to cut the noise.
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Michelin Pilot Super Sport tires. Sprint Booster (no more throttle lag). Dynamat and acoustic foam. Invidia Gemini CBE. Mishimoto intakes.
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