I won't be trying anything clever, it's easy to go too far and mess it up.
Designers always have ideas to increase swirl and direction, it's best not to go round grinding lumps off willy nilly.
For example, at the end of each inlet is this weird little ramp, half has been machined off, half remains.
What does it do? Does it make a difference? I'm not feeling brave or desperate enough to risk removing it.
