Its time to find out once and for all what type of Pistons are used in the Aus Road Spec 02-05 STI's. Open, semi or fully closed block would be good info whilst we are at it.

Lets avoid hearsay and assumptions if we can so please include the source of any info. Stace can you provide a link to the engine numbers? It seems anytime an STI bottom end pops up with forged pistons and a semi closed deck it is immediately assumed it must be an 02...

Recapping, how did we get here? Subaru Marketing (unconfirmed source in my book) said the 02-05 STI's had the Hyperutectic Pistons. Then local workshops find real Forged Pistons in the Aus 02 STI's. Hence the Myth is born.

Any volunteers for a team of "Block Busters" to visit John Keating at Regents and inspect the pistons his Blocks have. Not conclusive but additional info. Has anyone cracked an 03-05 STI ?

Has this matter been discussed on other forums, if so what was the key finding?