Guys, does anyone know the nut size for the header to cat connection? There's 3 nuts and I want to make sure I have some new ones after I take off the currently rusted on ones. Can't tell the outside because they are rusted on. Tried 12mm and the rust kept it from going into place the 11mm was too small and the 13mm was too big...

Also, what is the size of the nuts for the header to engine block? The outside is 13mm but not sure the inside.

 

I would like to go to home depot or lowes to just buy these nuts versus having to go to the porsche dealer...

 

Call the dealer and ask.

 

They should be 8 x 13. We can order them for you if needed. For more information Click Here.