In MA after market exhaust is perfectly legal in of itself. However they passed a new law last year that states that any installed exhaust can not be louder than stock. Ah ... who exactly has this information and who did they give it to? I know a guy that was failed on their annual safety inspection because the inspector said the car was too loud ... yet the car was stock.
Stock quiet on a Toyota Camry is a bit different than stock quiet on a Z06 Corvette.
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