Exhaust header OD

[Fraserc]

I have been offered a set of original suzuki exhaust headers for a Gs1000 and been told that they are 40mm OD. Checked the 4 into 1 currently fitted and the od of the headers is max 38mm.

Can anyone advise if the larger OD pipes will fit. My plan is to buy the headers and then find matching original mufflers (end cans). My bike is a 1977 Gs1000HC.

[Fraserc]

Does anyone know if there is a difference in early or later model gs1000 exhaust header Outside Diameter ?

[Dave8338]

Should be the same at the head. No changes in the 1000 8-valve that I know of, during that time. Either way, the crush gasket at the head if new, should take up any additional difference in the OD.

[TheCafeKid]

Stock systems were double wall pipes, most aftermarket were single wall. Likely the difference there. I'm sure, if they're actuall GS1000 pipes they'll fit fine.