USA A15 compression was 8.3 to 8.5 due to larger dish
Every automaker has gone to high compression with turbo. Only in racing classes do they still use low compression with turbo
PAECO forged
http://www.paeco.com/Piston%20Prices.htm - L16 $460 set
http://www.paeco.com/Piston%20Ordering.htm - Pistons can be made up for any engine in any bore size or compression ratio
Venolia piston for stock A15 is part number 10400
http://www.venolia.com - use the custom order form
forgies $80 each in 2014 - email for current price
Ross Racing Pistons
https://www.rosspistons.com/custom-pistons - use custom form for A15 pistons
for example forged set for SR20DET (4 pistons, pins & rings)
$610 USD complete setRB pistons $820 set of six
Oh, and many of these USA companies have the A15 specs on file ...