cavemanmoron said

When I had the duals put on my car, the interior resonance was
annoying, to me, and it really bothered my G/F.

{I am using Dynomax Super Turbo mufflers}

I decided to add some sound deadner to the floor under the rear seat,
and the package tray areas;
heck, there wasn't even carpet padding under the back seat.

The car is much quieter inside now. :)

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