The truck is in the Wisconsin/Iowa area and the temp. here has been in the teens accept for some mornings its in the negatives. I noticed this last week, but when starting out theres no boost. After awhile the turbo comes in and it builds fine. But it takes longer than it did when it was on the stock tune. I just got the SRL from matt, and a day later i noticed it. The truck is straight piped and when its idling i used to be able to hear the turbo whistle but now it just sounds like a deep v8 gas engine.
Also, last thursday i was getting on the highway and i got on it, got up to 65 and i looked at the boost gauge 0. After about 30 secs i heard a whistle and the boost jumped to 12psi. and i could feel the truck kinda take off.
Also, the last 2 weeks i had the truck(has been with my parents for long trips) i've noticed a rattling coming from under the hood. I checked all the exhaust brackets and the clamp on the downpipe after the turbo. They were all tight.
Truck is my DD, so i need this problem fixed asap.
Thanks in advance,