I'm going to be getting some pistons and rods this weekend and I was thinking about getting 81.5mm low compression pistons like 9.0:1. Shouldn't be a problem if I go over .5mm for boost should there ? As in safety and power ?

 

You're fine .5 won't be that big of a deal.

 

Thank you. There should be a better increase in power as well right ?

 

By going .5 over ? No not really

 

With the 81.5mm, you have more room for expansion if something were to go wrong. Personally I would go with some Nippon cast pistons as they are softer than forged pistons, more friendly with stock sleeves.