New TRD exhaust too loud

[ArtS]

I will say up front I am a senior citizen so consider that when flaming me. I just installed a TRD exhaust on my 2007 Yaris hatchback and am very disappointed with the interior noise. I wanted a little more sound but with this TRD muffler during normal acceleration it is way too loud for comfort. It seems at high rpm it is not too much louder than stock but under low rpm load it a pain. It seems the droning may be the spare tire compartment sheet metal vibrating too much (the TRD muffler has an additional rubber hanger that attaches under the spare tire area. Would adding some deadener to the spare tire area (dynamat?) be worth the effort and cost? Iv'e got the stock muffler back on for now.