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Actually, 4GS not that noisy; quite quiet in fact.
A little noisier than 3GS at idle, full throttle, and the grippy Dunlop Sport Maxx performance summer tires are certainly a little noisier above 50 mph - however, still a very quiet car.
I only find the springing firm, but then that's how they reduce weight transfer to the two outside wheels, planting all four tires on the ground to maximize grip for quicker turn-in, and greater maximum terminal grip.
i did dynamat in the doors and upgraded the tires to the michelin Pilot Sport AS/3+. My car is now super quiet and the Mark Levinson system sound even better than it did, true story.
The Dynamat was very easy to do and took about three hours total. Only three screws hold the door panel on
What part of the inside of the door did you dynamat?
The outer part of the door or the inner part behind the door panel?