Stock Manifold Collector Size 4 Cyl.

[JDM Sam]

Anyone here know the stock collector size of the exhaust manifold for 4 cyl Mazda 6? If someone can measure the inner diameter I'd appreciate it.
I need it for a header R&D.

[BlueSolrac]

Anyone here know the stock collector size of the exhaust manifold for 4 cyl Mazda 6? If someone can measure the inner diameter I'd appreciate it.
I need it for a header R&D.

I don't have any calipers or any way of measuring the inside here, but next time I'm in Dallas we can meet up if you want.

[JDM Sam]

I think my guy got it already. It's being released once he finds a test fitter.