Use the MPG Caps they will definetly make you pass you're emissions test they reduce emissions 75-100%. I use them and they really do work!! Check out this link on you tube.http://www.youtube.com/watch?v=YLqVWxxIMfA. If you want more info on this product go to this link. http://www.kbnsons.myffi.biz/en/ or email me John at [email]kb_n_sons@hotmail.com.[/email] Good luck!!