Sprint cars make power with less header diameter than drag racers typically use. 900hp on 1 7/8”.

Probably a more relevant comparison for a marine application. They try to make the widest useable power band because they don’t have transmissions.

Sorry, that comment was in regards to intake port CSA.
And I'm referring to collectors as the OP was asking about. Tuning header pipes is a is a different dynamic. But in that regard, I would still default fault to large, long tube headers if I didn't have the time, money and resources to setup a DOE for a specific application. In that case I default to a reputable manufacturer or an expert that has already done it. There are few "All Out" builds in this "Tech" forum.