Left Axle-Back Exhaust/Muffler Assembly - 1990 300ZX Z32

The Z32 generation Nissan 300ZX Twin Turbo utilizes a true dual exhaust system requiring distinct left and right axle-back assemblies. For the driver's side left muffler, OEM reference numbers include 20100-30P01 (superseded to 20100-40P00), specifically engineered for the VG30DETT twin-turbo platform with 2.5-inch inlet piping. These units interchange across 1990-1996 USDM Twin Turbo models, though naturally aspirated variants use incompatible configurations with smaller diameter piping and different mounting points. When junkyard hunting, inspect the 2-bolt flange at the B-pipe junction for warping and check the three rubber hanger mounts for torn bushings. Common failures include internal baffle rattle from broken welds and external rust at the case seams, particularly in salt-belt regions. Installation requires supporting the mid-pipe to prevent stress on the flex joint and ensuring proper clearance from the rear subframe. Always verify the stamped code "30P0" on the muffler body and confirm the twin-turbo specific flange pattern, as left and right sides feature asymmetric tip positioning and are not interchangeable.