What makes newer model cars quieter?

Question:
Yet another random question...
Why is it that older cars make quite a bit of noise, even when they were new, yet newer model cars are very quiet, sometimes even unnoticeable?

Answers:

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Various factors but mainly we can start on the platform. The integrity/strength of the platform, is in reality the foundation...everything thereafter will be impacted.

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The suspension is quiet if it's a "sub-frame" which is anchored to the platform using rubber isolated bushings, so that quiets down things a bit.

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The next biggest factor is insulation. Where it's applied, how much of it is being used. One being "Quietsteel" which is being bragged about by Ford and Buick, which allows the F-150 to post the quietest interior for a truck (essentially being a boxy vehicle takes alot to quiet down).

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The thickness of glass is another factor which helps make a vehicle quiet.

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Engines also are receiving quite the overhaul to make them quieter, same with transmission.

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Undercarriage aerodynamic engineering helps, as styling as well. The softer the curbs, the smaller the panel gaps, the quieter the vehicle can be made.

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Granted, all this is commanded by consumers... Yes we want quieter, but there's a price to pay...All the above will easily added 400-600lbs on a vehicle in comparison to cars from 15 years ago.

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Yes we want more safety, quietness, more power, and better fuel efficiency. So the more we are asking for the above issues, it's a wonder the some vehicles can actually improve fuel efficiency considering the above.

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exhaust...mainly everything from the headers on the motor to the exhaust to the catalytic converter. Makes a big difference.

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Undercoating and insulation are the main changes in autos that have contributed to a much quieter ride. Newer types of suspensions also help.

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also injection vs carbs

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The engineering dept.
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