45/42/38MM Exhaust (Step) Adjuster Pipe.

This little friend helps you to fit a muffler on a modern exhaust. Also available in multiple sizes. 

This one: 45/42/38 mm
This is the outer diameter
The material has a thickness of 1.5 mm
So, a 45/42/38 mm pipe has a 42/39/35 mm inner diameter.
Price PER 1 piece