This is my take, im conflicted. Kinda from another question, but kinda related to the gde.
The only thing I'd delete is the scr. Gde announced yesterday a new tune for CCV mods for cel problems, but they don't do scr delete tunes, but on the flip side Celtic tuning does the scr delete but does not do the CCV tune. On the one side I hate oil messing up my intake and valves but on the other I have this evil demon hiding in my exhaust system. I think about it every day. So for one I am super happy and content with my power level programming so I don't care about horsepower gains. 2. My truck has been mint flawless perfect with everything on the emissions side. I don't know if it's because of all my mods, my driving or the way I maintain it, but I promise you my truck is better now the way it runs than last year. 3. My new CCV kit has been doing good so far and to date @ 132000 miles I've stopped about 10 quarts of oil going through the cac. I'm going through a complete computer zero relearn on the whole emission systems monitoring system right now to see if all monitors will hit readiness all by itself with my master ccv kit. If it hits allready, I'll guarantee it and sell it. As a note, whenever a monitor is not ready for emissions testing, the entire mode 06 system is ultra ultra ultra sensitive to the slightest out of range condition. So until the system completely hits readiness you'll have a nightmare of a time getting good mileage and keeping pending codes at bay. So both Celtic and gde will turn the egr off which is great but I don't know if when they're changing those specific monitors range values if those monitors will never show ready, if that's the case I'll never be able to legally pass emissions in my state. All monitors must show ready. I am an emissions control master tech. So decisions decisions.