My truck is just as quiet if not more quiet in the cab. I can hear a slight whistle from the turbo, little high-pitched sound, not unplesant. Truthfully, it could have been there all along and I just did not notice it. I had about a 75* EGT average reduction when towing hills, cruising on the flat was about 100* reduction. I have only done towing since I put it all together, so my fuel comparison is when I fueled up. I am just about 150 miles into a tank that the truck is running empty/unladen, but I DO think the mileage is increased there too as the gauge is not reading as much fuel used as it had been before. The overhead is telling me my mileage is better also, but I use a calculator after a fill up, don't trust the overhead even though it has agreed with the calculator so far. Too many complaints about the overhead from everyone. I can update you in a couple of days as I have a couple hundred+ mile trip to make on Thursday. I have not had the cold start re-flash. Actually have had NO reflashes or tsb's. I had several incidents (about 9 I think) with a P0191 code referenced to the fuel rail sensor, which the dealer has cleared each time writing them off as a computer glitch. That was one of my main reasons for modding the airbox and changing the intake between the air box and turbo. Since installing the hose and box mod I have not had the code again so far. I have an auto that is turbo'd and had several problems with the fuel rail sensors in it and after getting the air/fuel ratio up to a more acceptable level - problems were solved. I know that comparing a gasser to a diesel is like apples and oranges but the sensors work the same way. Also, less heat soak with the silicone hose by it's design. My truck has started right up every time almost instantly when it's cold below the 59* mark and the coil heater has to come on - the wait to start thing. When its above the 59* mark and no need for the heater in the am it also starts right up. The only starting problem I have been having recently is more of a hot start problem. At 3-4pm when the ambient temp here is about 90 or more and the truck has been in the sun all day - you could fry eggs on the hood. I guess maybe the heat has something to do with it needing to crank a few seconds more. Made in Mexico and can't take the heat!
CD