Is it exhaust sound or by "blower" do you mean the engine fan? The Tundras with the 4.7 do have a little bit of a throaty exhaust note but it shouldn't be too objectionable from the inside.
Do you have a supercharger installed? I believe it was available on the 3.4 but not the 4.7. If so, it normally produces a whining sound that isn't normally heard from the normally-aspirated engine.
Since you mention "blower", it's probably not an exhaust leak or an aftermarket, resonator or free-flowing exhaust system that sounds more burbly and growly.
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