doing some thinking
audi pistons come in at 81mm stock bore
32.66 CH
So with the stock rod CTC size you would need a 2mm thich HG
Losing out .29mm
They are dished pistons
Not sure how much .29mm will drop compression by, maybe too much.

That or shave off .71mm from the piston top to use stock HG and keep it to same total size compared to stock piston\rod length

its funny how people like joe here have these epic rants, imagine doing that on miata.net lol
And seriously techsalvager, go for it, at least your thinking rather than following. And its your cash lol not mine.

Dann

Just a note the PR4 honda pistons fit nicely with the stock valves