Dual resonators are no longer on my car. Started it up with the exhaust cut off and immediatly decided the mufler will stay. The exhaust note is quite a bit deeper and louder. Seat of the pants o meter indicates there may have been some minor performance gain. Happy with the overall results.

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1982 300sd, new project car to restore

It doesn't matter if you know what you're doing, as long as you look like you know what you're doing.