Ok so this morning i got in the truck started down the highway got onto it to get around this slow car and noticed a hissing noise from under the hood at first i thought it was a boost line to my gauge i checked it and it's all fine next i thought maybe the wastegate had iced up or suck open messed with the accuator and everything seams fine what else would make it hiss at high boost.

 

Hole in intercooler boot? Or a silicone boot on the twin piping

 

Thanks i'll have to check them if it was above 15 outside i would have already had them tore down and checked. egt still stay the same still has same power so must just be a small hole.

 

Yep get some soapy water in a spray bottle and spray the boots. It if bubbles you have a hole

 

So i checked the boots today and could not find any bubbles.

 

Have somebody ride under the hood while you are going down the road and see if they can see any bubbles then. Just kidding. the hole in the boot will not be that big. Probably just a pin hole. Check anywhere that could rub. also check the intake horn gasket on top and bottom of the grid heater.

 

Thanks i can hear the sound is on the passenger side just cant pinpoint it i think i might just replace the boots and see if that helps.

Thanks