quick questions

firstly is there a reason that my turbo return to the header tank is below the level of liquid( maybe to prevent cavitation or something)?

Also the std turbo return pipework has varying diameters throughout are the like miniature expansions?

Also i take it the swirl pot return is above the liquid level as its for removing air bubbles?

I ask cos ive bought an ally header tank but the swirl pot connection has been blanked of, i am getting this redone but while getting this done i was gonna stick another connection in (8mm) for my new braided line from the turbo. and was unsure whether to mod the original connection or blank it off and stick one next to the swirl pot one.

Regards

Steve