Are sleeve savers good for running a gsr with type r pistons ?

 

they're crap and will likely cause hot spots/warp the factory sleeves.

keep the stock sleeves, the metal is superior for wear (life) of your rings, but remove the block and have it rehoned before you put in the new pistons (the block MUST be removed to get it done right).

I don't like replacement sleeves because the metal isn't as good for longevity of the motor, but most people don't run their cars over 100k anyway without blowing it up, so do what you want.