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Message: [QUOTE="Powerstroked162, post: 1142430, member: 120"] I think that's pretty much what I had said previously, so I'm not sure if we are agreeing or disagreeing lol. Either way, I've spent a lot of time working with Eric on tuning, and numerous hours on the phone with Morgan in conversation about this particular "problem" i guess you could call it. Between the three of us I think we've come to agree that it's related to passive regen, tip-in lag allowing fuel(soot particles) into the exhaust stream at a higher rate than experienced in a stock turbo form, and a increase in exhaust pressure against the dpf load. My truck with a clean DPF drives completely different than it does when particle matter starts to build up, which isn't really a shocker I'm sure lol. Backpressure is live in the downpipe toward the higher end of the load spectrum though, enough to crack a 68lb gate reference and bark the charger on shifts, low RPM driving, or under the charger on any type of incline grade in 5th or 6th. Usually at that point, the truck limps and i've gotta force a regen to get back to square 1. Of course that happened about every 100 miles on the aggressive tuning, and less with others. Eric does a great job of tweaking files so I can keep trying though. He's gotten much closer recently. The newest tune in my truck hasn't limped in two tanks of fuel, but regen cycles are still continuous, which like stated is more or less related to the efficiency of the 64 I talked with Morgan again this evening and I told him this as well, I'm gonna try my 4" downpipe and see if the added volume will be enough to help any of the issues the truck is facing. After that, I'll be adding a 60mm gate to the downpipe with boost reference and moving forward. Ultimately, thats not what I'm wanting to have to do(as far as the atmo dump gate is concerned) but if it helps and tuning isn't able to correct what the setup faces, It is what it is. What turbo tables are you using? I've tried several tunes with modified tables and some with stock, so far the modded tables i've used seem to be the best. The stock ECM tune file and the 64 experience the same issues as the aggressive tuning, it's just not as persistent. [/QUOTE]