I too tend to find the comment of "forged engine" very funny. Many of my mates say "oh yeh, my cuz has forgies, etc, it means he's engine has heaps of power, bla bla bla." I just humour them and agree. But what they fail to understand is that "forging" is just the process of making the metal part, i.e. a piston. It is the process of compacting (pressing down) aka dropped forged, a piece of metal to shape it into a piece/part. It does not in any way "make power".
What people don't realise is that forged internals exist from factory.lol The factory made components in engines have all gone through a process known as liquid forging or cast forging. The difference is that, dropped forging ensures 99.9% of the metal molecules are "stressed" in the same way through the manufacturing process and liquid forged tend to have molecules heavily separated, etc. this is why most liquid forged or cast items cannot withstand the pressures that most dropped forged components do. This, however, does not necessarily means the factory items are bad in any way. I.e my r33 has been completely rebuilt (will post thread in next few weeks) and when searching for parts, I tended to seek manufacturing processes. I chose to replace the parts since I saved my pennies and start a project with my father who has been a mechanical engineer for 35 years, however, the stock bottom end of the rb25det is strong to 500hp reliably everyday.
My pistons are JE custom made to my specification of compression ratio of 8.6:1 and they are definitely not liquid forged items. They are billeted aluminium dropped forged blanks that have been CNC machined to near perfect thresholds.
Just my two cents anyway.