Then you will find guys like me and my neighbor who will eventually figure out a work around to rip all of the garbage out of vehicles and equipment that is totally unnecessary to make an engine run A gasoline engine requires a fuel/air mixture, compression, spark, and exhaust, the engine itself does not care how it gets these things as long as it gets them. A diesel engine needs it just a little differently the air is compressed fuel is injected under pressure at the appropriate time to cause combustion and exhaust. I know where there are 50-year-old engines still running that will pass almost all emissions standards in California of all places providing you can feed them with the correct quality fuel and do so with a 15 to 20% better efficiency than an engine of today's manufacture with all of the emission controls in place