size of exhaust pipe

[JaysonD]

On a mk2 16v 1.2 clio I'm looking for the size of the pipe on the back box as I'm buying a different backbox but I need a reducer pipe welded onto it so it will fit. But my problem is I don't know what size my exhaust pipe is for me to buy one and my exhaust is the original one piece so I can't just unclamp and measure! Really need help been looking for ages

 

[ben lee]

think its 40mm

 

[stephen chadwick]

ask someone ''mechanical'' to measure it for you with a vernier.

 

[MWright]

think its 40mm

This 100% 40mm OD.