I just purchased my first diesel. A 08 crew cab with the 6.4. The truck runs great and has 135000 on it. I've been reading a lot about egr and dpf deletes and want to do that to mine. I know this has been discussed a lot and I've read alot of post but I'm not sure which one would be best for me. The truck has all the power I need and I'm not really concerned with fuel mileage. I've read that doing this makes the trucks more reliable which is really all I'm concerned about. Thanks for all the help.