I have a '04 Desert Runner 6 cyl Frontier, it just started to develop an exhaust leak at the bracket pipe that connects the muffler system to the Y-Pipe. The problem is the Frontier microfiche shows the y-pipe as having a flange to mate to the muffler system but it doesn't , it really uses this bracket pipe. The parts dept. ordered in the y-pipe to see if it came with it, even though it doesnt show in the fiche, they also ordered the bracket they saw in the fiche. THe y-pipe came but no flange, its like the one on my truck and needs this 'bracket pipe' part to mate to the muffler system. They are sending a query to Nissan to see whats up, I came here. Anyone know this part? Anyone who changed or upgraded want to sell their unwanted part?
the part you labeled as "muffler system" is aftermarket.
from the factory, there is a rubber hanger on the frame after the flange of the Y pipe that helps hold the muffler in place. whoever did that exhaust setup was retarded and shouldn't have added a rigid support like that since the exhaust sees so much vibration.