12v exhaust manifold runner size?

I've done a number of searches and find nothing . . .

Is there any published information about the various 12v exhaust manifolds that describe the runner size?

I've seen where cppdiesel.com offers one (SD2G12VT3) that sports 1.65" runners.

Anybody know what the others might be?

Thanks guys.

Also, I'm talking about T3 manifolds.

I've read some of the guys building their own manifolds are using sch 10 1.5". That would give ID of 1.682".

Like most things however it depends on your application. If your lower hp and need response more then stick with smaller ID like 1.5".

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Thekid760 said:

I've read some of the guys building their own manifolds are using sch 10 1.5". That would give ID of 1.682".

Like most things however it depends on your application. If your lower hp and need response more then stick with smaller ID like 1.5".

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I'm well aware of that. That's why I ask if anyone knows what the currently available 12v T3 manifolds are.