a properly functioning new Diesel will run great when properly tuned with the DPF attached. i work on Internationals (Maxxforce and DT line), i deal with DPF's every day. the temps are brief, the ECU injects extra fuel into the DPF, not the engine, to burn off what particulate has been caught (when the ECU detects too much backpressure), and its done. yes the temps are high, but they are in the DPF, which is designed to handle it. even Cummins is using DPF's now. the only issues are when the DPF wont regen because of a damaged DPF or a damaged injector. if your truck has DPF issues, i hope its still under warranty.
i want to mention that i am not trying to start a fight, im just voicing my experience. if you delete, thats fine, thats your choice. my truck had a cat only when i bought it, and i cut it out. i just wanted to point out that these engines are designed to run with the DPF intact (since the 6.4 is a Maxxforce 7), and by EPA and government regulations, we are in deep you know what if we remove these. we are talking thousands and thousands of fines for the truck shop, the tech that did it, the driver of the truck, and the owner of the truck.
I know turbos and the less back pressure the fast the spool. Not to mention I just did an oil change....didn't even wait to get to 5K and I drained almost 5 gal. from the truck. 15 quarts is about 4 1/2 gal. can u guess where the other 1/2 gal. came from? Diesel from all the stupid regen's from driving around town so much. I hit 9 regens in 2,800 miles. NOT COOL!
if you are having to regen that often, you have a problem. i would have it checked ASAP. it either is not regening properly (injector at DPF issue, backpressure sensor issue, etc), or your DPF is damaged. now, if your truck is out of warranty, by all means, tear that sucker our and recycle it (its worth a lot of money). you DO NOT want to pay for one of these out of pocket. trust me.