What closed Cell foam to use?

[stylez777 10+ year member]

Price not being an object which is best to use?

-Ensolite 1/8 inch thick

-Overkill 1/8 inch thick

-Overkill Pro 3/8 inch thick

Does the thickness in the foam mean it will filter out more noise?

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[Rudy 10+ year member]

Price not being an object which is best to use?
-Ensolite 1/8 inch thick

-Overkill 1/8 inch thick

-Overkill Pro 3/8 inch thick

Does the thickness in the foam mean it will filter out more noise?

Yup.

1/8" >= 27 kHz

1/4" >= 13.5 kHz

3/8" >= 9 kHz

No foam that you can fit in a car is going to do anything with mids and below. To handle 250 Hz, you'd need foam 13.5" thick. 100Hz? 34" thick.