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Actually, Vbagger, you are partially correct; a 3 db increase is what the 'average' human ear senses as doubling the sound volume. 10 db is way more than that.
You are correct on controlling the high pitch (tinny/metalic) sound, that is a big part of what is perceived as being loud or obnoxious. That deep mellow tone is amost always prefered over the loud higher pitch of a straight drag pipe as an example.
EPA drive by testing is very difficult and expensive to do, most exhaust manufacturers use the J1287 stationary test for comparision (including ourselves, ST, but also FMF, PC, HMF, VH, etc.) Regardless, the drive by testing is almost useless to an aftermarket manufacturer as there are many other factors that add to the 'drive by noise' other than the exhaust; intake, mirrors, fenders (Indian), drive belt/system, wheels/tires, etc. Drive by testing is more applicable to the OEM manufacturer.
Tell Ken hello from Cleveland-Jeff
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