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How to analysis a muffler(decibel & Frequency rate of outlet)? please help!!!!

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Hi guys!
I have a model muffler of an exhaust that will to analysis. i will to measure Sound intensity(db)
& frequency of outlet. i show a picture of my muffler in this picture(I show inlet & outlet,too):

upload.tehran98.com/img1/f9pdgyt0f3szwoo43k5v.jpg

I have several question:

1- Which calculator should I use(which interfaces?(pressure acoustics(frequency domain(acpr)) or...))?
2- How to meshing?

My Assumptions is on inlet:
frequency range: 1000hz to 20000hz
Sound intensity range: 30db to 130db

Now, I will calculate sound intensity & frequency of outlet. I will to know that my muffler how Reduced the sound intensity & frequency of outlet.
How to do this job?
please help me!

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