As to the temperatures, I posted this on another forum.
I just pulled into the garage after nearly completing a regen. It started when I was 500 feet from the house (as usual) so I drove an extra 10 minutes up to the highway and back to give it time to nearly complete. I wanted to take the temps on the new exhaust parts to see how hot everything is. So I grabbed my infrared thermometer out of the center console and went around the back of the truck only to find the batteries dead! This is where I jog into the house to get a new battery, tripping up the stairs and slamming my sorry face into the still locked door. My wife and kids, hearing the commotion in the garage, opened the door to find me with a bloody nose, crushed Big Gulp cup and soaked shirt and pants. They're asking me what happened and I'm yelling, Get a battery! Get a new 9V battery! They ignore me (as usual) and I jog dripping Diet Mountain Dew through the house, to the office where the battery supply is. I find a new battery but I can't get the cover off the thermometer because my left hand is holding my nose and my right hand is too slippery from the Diet Mountain Dew. So I decide to just do a long inhale (hoping I can breathe in long enough to use my left hand) and switch the battery. I notice my middle daughter with her android phone now taking pictures saying, "This is so cool." I jog back to the garage and forget the Diet Mountain Dew soaked stairs and, you guessed it, ended up on a neat VCT tile floor in a heap. Fortunately there are only four stairs so the amount of energy I had picked up on the way down was less than that needed to break any bones. At this point, my family showed some genuine concern for a few seconds until I got up and limped over to the back of the truck.
Ok, I just wanted you guys to know my dedication to the forum to provide good, accurate temperature data on the new exhaust.
External DPF temp - 190 degrees
External straight Dynomax spacer tube - 190 degrees
External tube temp just behind the rear tire - 178 degrees
External stainless steel tip temp - 78 degrees on forward side 102 degrees on the back side. (I think the polished surface did not allow a proper reading because it was too hot to touch)
Internal temperature of the tip - 280 degrees
Internal temp of the 5 inch tube inside of the tip - 380 degrees.
So clearly the outside exhaust tube walls are a couple hundred degrees cooler than the inside of the tube. This is likely due to the cold outside temperatures to start with and the normal cooling that happens when air is passing over it.
So there you have it. I never did measure the temps on the OEM exhaust so I have no comparison. Someone else needs to do that but I recommend you check the battery in your thermometer before you start
11 in the video) and attach it to something underneath. Then I copy the raw video files to the PC for editing. It's really easy. Most of what I do is family stuff but it's fun to share something on the truck.
