ap1 s2000 internals

hey im 18 and i just got a 2000 ap1 s2000. i havent been doing the whole tuning thing for along time so im still learning. and i have a few questions.

i want to run forced induction through a turbo and build the internals so i can run lower than stock compression.

i know the stock internals can handle around 400wph however i want to build the internals still so i can run high psi boost if i feel like it every once in a while safley.

the f20c in the s2000 has frm line cylinders. i keep hearing that if you put in aftermarket pistons in the f20c without sleeving the cyclinders it will damage the cyclinder walls. however i just read that mahle makes pistons that can go right in.
is it a certain coating? what do you have to do to make certain aftermarket pistons work with the f20c's frm cylinders. the pistons i want a cp's low compression 9:1 compression pistons. they are forged and i want to know if i have to sleeve my cylinders first before running them.