I have the same problem on my MO. Went to a local shop and they want $75 to cut out the flange and weld in a straight pipe. I checked Midas and they want $80. Gonna check around at other places as I think it can be done for less. I'm in Elizabeth, NJ in case anybody here on the forum knows of any place that can do it cheaper.
And just wanted to also say that I love this forum. Its the best place for MO owners. Everyone is super friendly and helpful.
2005 Murano S_Black_2WD
Repairs to Date (all done myself): Lower Control Arms, Front Right Axle Half Shaft, High Pressure Power Steering Hose, Oil Pan, Front & Side Motor Mounts, Coolant Drain/Refill, Drive Belts, Front Struts, Oil Cooler Gasket, Camshaft Position Sensors, Rear Shocks
Repairs Coming Soon: Spark Plugs, Valve Cover (if leaking oil).