actually.. its not comparison between 2008 and 2009 'car'.. its only focusing on the wing.. my bad for stating its name 2008 car and 2009 car.. its like this.. for example..
if.. 2008 is same as before but for 2009 its the changes but it keep the same wing as 2008.. i wanted to know what will happen if only the wing were change.. i can make same car as 2008 but it would take longer time to meshing it.. and if i made 2008 same as the the real car with all the winglet and so on.. the variable would not be the wings now? i have no clue