Dynamat the Cab......

[dwcsr]

Another option we use is the deadening strips in various places, not the whole cab or floor, to change the resonance and then use THERMOZITE over top for heat control. we also use a heat resistant product like Thermo-Tec adhesive backed heat barrier on the firewall and underside of the tunnel. It cuts the noise dramatically and also salve a ton over the premium brand name products. The nice thing out Thermozite is its a poly fiber and won't hold moisture to rot a floor panel.

If you have a sub box or high end sound then you may want to cover more area then add the Thermozite.

The object is to keep road noise out, engine noise and heat out, cool in, and dampen or change the frequency of the sheet metal vibration to a point where we can't hear it.

And as stated above it will never be a Lexus but it can be very comfortable.