got a '01 HD with the 6.0L. bought some obx headers+ y-pipe off ebay... ive had it up on the rack several times at different shops trying to figure out where the "leak" is coming from... it doesnt exactly sound like a leak, but its loud especially when right after shifting gears (5-speed) and the truck is under load. at cruise its not really noticeable. we could not pinpoint an exact spot where we thought a leak was, there is no black **** at any joint or weld and cannot feel any exhuast leaking. it sounds like you can hear exhuast pulses inside the y-pipe, almost like steady chattering inside the pipe. anyone ever heard of this?

 

is it like a pinging echoing sounds?

 

Pretty normal with aftermarket headers. The factory cast iron manifolds hide the sound.

 

okay just making sure its normal. think wrapping it with header wrap with help insulate the noise?

 

Yup, sure will, along with drop under hood temps alot...

 

Yup just normal noise, wrap em can help the noise, or dynomat the floor also works great

 

same noise here. just gotta live with it i guess. just kind of gets annoying with the windows down driving next to buildings and such

 

I personally think the sound is awesome
I would suggest dynomating the floor if it is really that bothersome

 

I like the sound my headers make too.

 

well i like the sound now too, now that i know its normal and not an exhuast leak for sure. awesome! i was scratchin my brains out trying to figure it out.