Hope you remember how to put it all back on for when you have to have the emission tests when its time to re-licence your truck. The physical removal of the EGR cooler and DPF exhaust are somewhat easy to remove with good wrenches and some mechanical "know how", however the truck won't run with these deleted without an after market re-tune of the computer control system that will shut the EGR, DPF and DEF systems off. I don't know what is available now because of EPA involvement, but some years ago a tuner could be bought with a box tune already loaded into the monitor. Other tunes need a special electronic tool (the name escapes my old mind) to load tunes. I had the first tuner/monitor from H&S when I first deleted my 2011 truck but recently had a nearby shop load an EZLynk tow tune into my truck that I had to purchase and Will ( the tech) then downloaded the tune from the "cloud" into the the truck's computer. The later box tunes from H&S were kind of hard on head gaskets, and these later versions left the owners with no way to adjust pre-injection timing levels. A lot of Cummins tuned with these box tunes lifted their head and stretched head bolts because of this. BTW, I live nowhere near the Peoples Republic of Kaliphornia, so I can't help you. Sorry