This is the O.S. Engines Speed T-170SC L52 Tuned Pipe Set for the 12XZ Speed Spec III Engine.
One O.S. Engines Tuned Pipe, One Header, One Header to Pipe Gasket, One Header to Engine Gasket, Three Header to Pipe Springs, and One Pipe to Engine Spring
Length: 5.5" (140mm)
Diameter: 1.3" (33mm) at widest point
Exhaust Diameter: 0.197" (5mm)