@soviet_merlin note how this is a twin scroll manifold and the "fabricator" has tried to make it a merge however I'm not sure he/she/it did very well at school and understand how gas/fluids flow.
And why re-invent the wheel? manifolds like these exist, and the merge is great, not to mention the pulses are split all the way to the wastegate's fire ring:
In the case of repeated flushes, you wouldn't bother sealing it if it's going to be removed again shortly afterward. Any little leak is not going to be a problem. You just seal it up the last time.
I'd wait at least several hours, preferably a day, before loading any joint sealed with thread compound. It is an anaerobic sealant, meaning it should go off straight after being locked up between threads. But I find it is still wet long after use. Just give it some time to firm up before pressurising it.
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