1800 Miata Header tube size?

[bobc_5]

Hi,

Does anyone know the o.d. of the tubes used for the 1800 Miata stock header?

Thank you in advance for any help.

Bob

 

[rhygin]

the dead stock one? LMk... I can measure tomorrow.
BB

 

[bobc_5]

Yes. straight from the factory.

Thank You

Bob

 

[bobc_5]

sorry to be a pest. does anyone have access to this information.

thank you in advance.

bob

 

[rhygin]

on the #4 header tube... my best "reasonable" circumference measurement is 125mm.... to save you the math... the OD is 40mm