1. May 10, 2011 at 6:44 PM #11
   

   Roush PSD Interceptor 7.3L Straight Piped Diesel

   Age:

   59

   Posts:

   9,862

   Likes Received:

   576

   Joined:

   Nov 28, 2010

   Location:

   Ringgold, Georgia

   Mine is the loudest at 2500rpm, that fits my gear ratio about 60-65mph.
   Maybe it's not a 40 series.

    

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