[Boxx]

I don't really think I am getting hung up on concepts.

I assumed a liner when I got that the engine was aluminum.
The XK Jaguars of roughly the same timeframe used 'Nicasil' liners.
Nickel is a real hard metal.
(They had problems with this alloy but I can't remember exactly what.
Something to do with leaded gas maybe.)

Liners are fairly thin. You don't just shave 4mm off of a liner (8mm bore increase).
You don't start out with a 10mm thick liner. At least I don't think.
What you do is increase the aluminum cylinder size (bore)
and put a similar-thickness liner inside of that.

If you had a liner. But - that is not how Porsche does it.

They have some coating placed on the inside cylinder walls.
I forget the name, but it acts just like a liner.
I distinctly remember reading that is why you can't just rebore
a cylinder in a Boxster.

Cylinder liners are not for changing bore sizes.
And in a Boxster they are not for changing period.

Unless you can show me how, my question stands:
- Bigger block or thinner walls?

(And keep in mind, that is even if the Boxster had cylinder liners instead of cylinder lining.)