Just wondering if anyone can tell me if or what the difference betweeen the 2 types of exhaust that Borla makes for our cars. They are the stingers or "S type" & then BORLA #14858. the only diffrence i could figure out is that the muffler is different on these, other then that they are identical, yet #14858 is about $60.00 more dollars. just need some info and hope a few guys can chime in and help me out.. thanks.