whats really funny is that if you use USDM ITR pistons in your b16, your compression will actually DROP from 10.2:1 to 9.725:1
JDM ITR pistons in your b16 will yeild 10.194:1, still lower than stock.
However, JDM CTR pistons will bump you up to 10.801:1
and JDM b16 sir2 pistons will give you 10.406:1
so, CTR pistons are probably the best bet for you if you want to stick with OEM honda pistons.
if you bump the bore up to 81.5mm (stanadard honda overbore), you will add compression as well.
for example, 81.5 CTR's will give you 10.903:1 as well as 1607cc displacement.
basically what it all comes down to is, more compression and more displacement = more torque, which = more horsepower