Recomended Piston
 

i was thinking about putting some CTR piston in my B20 how well would it run and if its a good idea

the b20 bore is 84mm and the ctr is 81mm
so you would need to have custom pistons made that match pct specs to fit the block

that would give 12:1 compression

Try forged JE Pistons. With CTR Pistons..10.8:1 on a n/a set up, I would rather get pistons with higher compression.