OEM honda pistons for b series are only offered in standard bore and .25mm oversized which is about .01". If you want or need to go to .020" then you will want to run forged aftermarket. .020" is the most I'd overbore on a boost engine and .040" is the biggest I'd go all motor unless you want to sleeve the block.
__________________
Don't bother giving me "rep", I won't return it and I think it is stupid.
Gracie Barra Clearwater
Gyms in Clearwater, St. Pete and Port Richey
pm me if you are interested in trying a free class at any of the gyms.