I did a search and didn't find anything, so I apologize if this has been covered. I put the Shelby to sleep for the winter, so my DD is a V-6 Contour. Speaking strictly about the engine, what are the differences that allow the extra 25 hp? heads? cams? tuning? I've looked at the physical difference between the standard V6 and the SVT version, and it looks the same on the exterior. I'm looking at doing some performance stuff and am not quite sure where to start. Any help would be appreciated.