That's an odd one. I didn't know. But, of course, if you are not getting the power output the car was sold to you with you can demand a refund for the car. Superchips offers a service to remove DPFs altogether and reflash the ECU to match. Gets rid of an unwanted hindrance. But we don't yet know if future diesel emissions smoke opacity tests will be toughened up for cars that are supposed to have DPFs. Probably not. But you never know the busybodies needing to justify their jobs paid for by the taxpayer will do next.