Does anyone know if there is any difference in the Dynomax kit that Jegs sells for $249 and most other places list for $322? Both seem to have the super turbo mufflers, so I do no know what would be different? Tom 91+ all over the garage in NJ Wilwood 4 pots, Rickety Rollbar, Simpson 6pts SHOCheap Racing.....Smoking SHO