Yeh I’m building my car mostly for street so was more drawn to 4032 for this reason.
But cant find much information on the pistons Iv found which are supertech. Supposedly they are rebranded iasa pistons from Argentina. I see p2uned use them in some of their a90 supra builds but not found anymore than that. If you Google it’s mostly Miata turbo guys using them or sr20det guys. Some say they are rated at 150hp per cylinder others say 200hp per cylinder.
I think any forged piston is superior over cast if the tune is correct.
My build will be completed shortly ones engine is built and will consist of;
2017 M140i
Westwood cylinder liners.
Supertech rods and pistons.
Walton g35 turbo kit.
Precision raceworks 750cc pi.
Walbro 525 secondary pump.
Reflex+
Not a lot of b58 information so thought I would ask the n54 crowd