Hi all. As my forthcoming MKIV build will be my first experience with V8 engines, can anyone help me understand the pros/cons and decision making around headers? Specifically with regard to whether to have a 4-1-4 collector or not. What difference does it make other than aesthetically and giving somewhere for an O2 sensor to be mounted?

I’ve also heard of double collectors - does this mean that it goes 4-1-4-1? Because I had assumed that as soon as you have single collector (4-1-4) you’ll have a second collector anyway in the muffler itself, unless you’re going for the full-on 8-exhaust pipe extravaganza like a P-51 Mustang (yes, they had the V-12 RR Merlin/Packard engine, I know ).

Thanks for the education!