WARNING!!!!! For all CA residents considering engine/exhaust system mods. Beginning Jan 1, 2010, all your diesel trucks will be subject to mandatory smog checks, just like gassers have been for years. AB 1488 was passed through the legislature and the governator signed it. It requires all lightweight diesel vehicles to pass smog tests. "THIS BILL ALONE WILL REMOVE ONE AND A HALF TONS OF DANGEROUS AIR POLLUTANTS A DAY IN CA" (according to my local commie assemblyman).