08 4.3 exhaust rumble !? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

NONHOG · 03-12-2009, 11:04 AM

Anyone have this issue ? Just curious , my Silverado "rumbles" during warm up just about when its fully warm(under load, part throttle) . 1st time I heard it I thought a semi truck was right next to me doing a jake brake.
Had it in the dealer for a couple of other warranty concerns and mentioned it.
They did not hear it but put in a section of flex before the muffler.
Because there was a TSB on it.
Now its more frequent but not as loud . Time for aftermarket cat back ?

Hoping for a cure .

03-12-2009, 11:04 AM	#1
NONHOG Registered User Join Date: Feb 2007 Location: Marana, Arizona Posts: 3,455	08 4.3 exhaust rumble !? Anyone have this issue ? Just curious , my Silverado "rumbles" during warm up just about when its fully warm(under load, part throttle) . 1st time I heard it I thought a semi truck was right next to me doing a jake brake. Had it in the dealer for a couple of other warranty concerns and mentioned it. They did not hear it but put in a section of flex before the muffler. Because there was a TSB on it. Now its more frequent but not as loud . Time for aftermarket cat back ? Hoping for a cure . __________________ "I feel the need for speed!"... as soon as I am done with my nap.



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