Retro-question regarding dividing undivided headers

[Tippy]

What is the dimensions/width of the 'divider' in a T4 flanged, divided header?

I put in 3/8" plate in mine but want to make sure that it is not supposed to be narrower choking top-end horsepower.

Here is the before and after (2nd is iPhone pic):

[Jim2]

It sounds like don't have your turbocharger yet. The port shape varies between Turbonetics, Garrett etc. Since you have plenty of meat in your divider you can do a nice job and port match your header and your turbine inlet.

This is Turbonetics T4 split:

[Tippy]

Yep, don't have one yet. Thought the dimension would be universal.

Thanks!

[930gt-40r]

I was always under the impression that they were universal- but like Jim said- would make for some nice port matching...

[Tippy]

Yeah, very true