I don't think they really have a handle on the DPF systems yet. Also...you won't be able to juice em anymore because you'll be clogging the DPFs too often and they will have to clean themselves out a lot. They are not cheap, and I don't know what king of warrananties they are going to have, ESPECIALLY with aftermarket shiz hooked up dumping more fuel in. From this point on, it's probably going to be pretty much left to stock.