I finished doing the stuff on blow off and back fire,but how to apply it in the game??

This post might be of use to you, assuming you use yamakawa's CSR:
http://www.lfsforum.net/showthread.php?p=219905#post219905

Quote from the_angry_angel :

This post might be of use to you, assuming you use yamakawa's CSR:
http://www.lfsforum.net/showthread.php?p=219905#post219905

Thanks!!