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So I finally got the noise figured out, in the end the 3rd cat (the one connected right before the exhaust splits to each muffler) was hollow due to it falling apart, this caused a "negative pressure" wave to travel back up to the headers and caused them to resonate (very raspy sound) around 2800-3500 rpm range. So to remedy this I welded in a a 2.25inch straight tube where the cat was as imaged below. Before this I also modified the original tranny mount just in case the engine was torquing enough where the manifold some how touched the tranny, this didnt fix it.
I cut the OEM manifold/tranny brace heres it mounted up^ Cut out the empty CAT and cut an equal sized 2.25inch pipe Heres the weld, just a series of spot welds with flux core (easy to burn a hole through) High temp painted Heres the final product Here it is installed
Heres where the manifold was hitting the engine mount Heres where the manifold was hitting the engine mount The manifold also was very very close to this nut on this bracket attached to the transmission. I filled away at the engine mount a tad I removed the bracket, it just holds those lines from moving even though they are rigidly mounted Here is the bracket once removed
You could've just use some flex seal on that mount it was hitting. It's literally rubber in a can. It works well in all conditions, and no one can see it...I know I'm super late lol.
02-25-19, 06:00 PM
