The STM Aluminum O2 Sensor Bung allows you to add bungs to your custom aluminum exhaust parts. The bungs are extra thick to reduce the chance of warping when welding. Steel plug is also included.- M18 x 1.5 Thread.- Accepts all standard O2 sensors.
The STM Stainless Steel Exhaust Flange is a 3/8" thick, 3" elongated 2-bolt design, machined right here in Rochester, NY.
The STM Aluminum Exhaust Flange is a 1/2" thick, 3" 2-bolt design, 6061 aluminum machined right here in Rochester, NY.