Cats bolted or welded to the y-pipe?
#3
They are welded into the Y-pipe. The Y-pipe is bolted up to the manifolds/headers and again bolted to the pipe that goes into the muffler.
You could unbolt the Y-pipe temporarily, but the o2's are behind the manifold bolts so you would loose them.
You could unbolt the Y-pipe temporarily, but the o2's are behind the manifold bolts so you would loose them.
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