i was going to say, drape a long strip of toilet paper slowly around till there's a breeze, or wave a incense stick, but bubbles sound like a good test also.
100% exhaust leak (aka header leak)....
get a spray bottle and put a little soap in it. spray around the manifolds and don't forget to check where the collector connects to your y-pipe. The water and soap will begin to bubble up if exhaust is coming out where it is not suppose to be.
HoginedgewoodMember Since 01 Feb 2017
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17 Silverado 5.3 2wd Custom