We started sound-level testing with the Loudmouth exhaust system. Yes, it is loud! Standing 30 feet from the rear of the SRT8 with the Hemi at 3,000 rpm, it produced 97 decibels. Rev it to 5,000 rpm and the meter measured over 100 decibels. Interior decibels at idle (windows up) measured 87. At a 50-70 mph blast, interior sound was a loud 100. Some people like noise. The stock exhaust produced only 77 decibels on the same full throttle 50-70 mph blast. Here's the audio from the Loudmouth II. At 30 feet 3,000 rpm: 91 decibels. Interior idle: 81 decibels. Interior full throttle 50-70 mph: 95 decibels.
We next wanted to try the PowerFlo mufflers with the Loudmouth tail pipes. This configuration sounded great! At 30 feet, 3,000 rpm sound lowered to 85 decibels. Interior idle 75 decibels, interior 50-70 mph 91 decibels.