In case everyone has not figured it out but the EPA and CARB hate diesels, if we want to keep these fuel efficient and useful engines around we need to be invisible as possible. The more the fools spray their soot the more likely we are to be driving electric Prius's. Grow up and be smart.Well I won't be as rude as some of the others, but as you can tell, not a lot of us are fans of rolling coal. The few boneheaded rednecks who do do that kind of stuff now a days has drawn down the wrath of the enviro nazis and EPA and has put some good reputable aftermarket companies out of business. Now, like most other freedom loving conservatives out there, we hate having laws passed and restrictions placed on what we can or cannot do, but rolling coal.. aka smoke tunes just isn't smart for many reasons. "Just because I want to." isn't a good reason, and is rather childish when everything is said and done. It gives a bad rap for the vast majority of responsible diesel owners who do have to live with DPF and DEF due to local, not to mention federal laws. Now- I happen to care about the environment, but am by no means a tree hugger, even though I love trees and wildlife and being able to four wheel drive/ATV throughout the country. I like the idea of cleaner air to breathe and doing less harm to the environment.. but I also firmly believe the best way to achieve cleaner air and such, is through slow and steady progress, not the stuff having to be shoved down our backs without the proper time to research and develop the technology. The DPF and DEF stuff did come upon us very quickly, thanks in large part due to the standards that were rather quickly enacted by politicians and enviro wacko groups. As a result, we saw the expensive and frustrating issues partaining to DEF and DPF, especially in the 2011-2016 models and still seeing some troubles. We simply ask that people out there stop the stupidity of deleting their emissions stuff because they want to experience the stupid thrill of seeing a ton of black smoke come out of their exhaust, and to "smoke out the evil Prius drivers"