I know it's a fair share of tuners on here that has been using the original RS500 turbos over the years.
If any of you would be so kind to let me know the correct spec of this turbo?

The compressorwheel (not T4, but from the bigger T-series) dimentions i do know, 58,4/83,9 58 trim, but it's the turbinewheel that's a tough one to find the info about

And i don't mean the "upgraded" aftermarket ones that doesn't have the correct F1-spec turbinewheel,
rebranded as RS500 turbos with stage 3 65/57 or stage 5 71/62 turbinewheel....

Anyone? Maybe the "RS500 T4", yes in exclemation marks, sales has dropped low enough that someone can speak freely?

"Best kept secret in the Cosworth community :P "