onequick5.3

iTrader: (1)

Installed the headers and may have a leak. There is a slight whistling noise coming from under my seat when you give some throttle it gets louder. It kinda sounds like when you start your truck up on a cold morning and your belts kinda make that whistleing noise that eventually goes away. I dont know if I have one or not?

TarheelZ

Are those the Dynatechs in your 'future mods' segment in your sig line? Did you have 'em installed or do it yourself?

mattrem

iTrader: (7)

Check your o2 sensors, I had one of mine come loose after about a week after I installed my Dynatechs.

onequick5.3

iTrader: (1)

Yes, they are Dyantechs and I will check the o2 sensors and I did install them myself. And I can understand the O2 sensor coming loose, it seemed like when I tightened them they would try to spin back around loose. But if they were the sensors wouldnt I have the check engine light go on?

greentahoe

iTrader: (2)

I had an exhaust leak and it didnt sound like what you described. Sounded sort of like a lawnmower/ tractor exhaust. I could especially hear it when I was next to a car or passing garages or something. It was pretty embarressing sounding. I just tightened my header bolts and I was good.

onequick5.3

iTrader: (1)

Maybe its just noise that Im not use to. This is the first set of headers that I have owned and I didnt know what to expect sound wise. It may be just the sound of the valve train and motor amplifying through the headers.

mattrem

iTrader: (7)

The driver side front was loose on mine, It would make a popping noise when you are on it real hard thats how I found mine. It was a very small leak, The SES light never came on, but when it was fixed the truck was quieter at idle and ran way better.