Click this link to SLP's site:
http://www.slponline.com/view_product.asp?P=31042A
Then click on "instructions" on the side bar to the left. The 3rd page of this PDF explains the design and legality of the system. The following statement is included:
Quote:
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Only actual laboratory decibel measurements are a fair measurement of a muffler’s effectiveness to quiet exhaust and should be required and completed to judge an exhaust system. Most jurisdictions do not have the ability to measure noise levels accurately. The testing is very subjective if not properly and accurately completed.
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