Not Ranked
An under car exhaust should be really cheap. Would depend on the mufflers you use. My guess anywhere from $200.00 to $400.00 parts, tax, labor included from the header flange back. Under car exhaust really allows the beautiful lines of the car to be more obvious.
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20mph is not fast, unless you are doing it in a 3/2, 1000sq. ft. house on 10 ft. waves! 
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