like the title says which pistons would i get if i were to do this? i know that with the itr rods and crank it increases compression so obvioulsy i would need lower compression pistons, but how low?

 

This should be posted in FI but let me offer my opinion. the lower you go is the is the further you can go on low octane (pump gas) 9.1:1 is what most people feel is the perfect medium, Personally I went far lower.