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The other thing to factor in is that they are 30 year old thrashed to death pistons.

something to factor in here is that the RS-RA is "hand crafted by sti" while the sti models up to ver2 were "tuned by sti". in regards to these early sti models the cars went from FHI factory to the sti factory then to the dealer, where as the ver3 onwards STI engine were built on the same line as the wrx engines etc what this means is that the pistons are probably Rare A.F to find the actual real deal or info on what they were from factory. even all the parts catalogues will show the wrong pistons without the correct FHI parts bulletin. for comparison sake assume all pistons from said cars are from something else unless proof the engine is original rsra/ v1-2 sti and un opened etc etc

MX-5 vs 86 vs Hellcat MX-5 vs 86 track battle at 12:50 Stupid power vs agility at 18:50

basically... Casting is where an alloy is heated to a liquid stage and poured into a mould where it cools and is then removed from the casting mould then machined. This is by far the cheapest process. Forging is where an alloy solid billet is heated and then two dies are squeezed together at enormous pressure to form the initial shape which is then machined for final result Semi forging is.. A billet is heated to its "Soft stage" then the soft material is injected into a cast die to form the initial shape which is then machined Cast pistons are usually made of a "Cheaper" alloy (Lowest cost per unit) Semi forged of a "Higher quality" alloy Forged of a "Highest quality" alloy. (Highest cost per unit) you will find especially in subarus pistons will be labeled or referred to as Hyperutectic. This piston is die cast of a higher alloy when compared to cast pistons. But is of a lower quality material than "Forged" pistons. so the term used frequently being "Semi forged" is incorrect. these pistons are "High temperature die cast"