anyone have anything that shows on a dyno the power increase with a 58mm throttlebody? i have a 52mm and want to know if its worth it for a 58mm?

 

It's unlikely that you will get a definitive answer. On a stock engine that is reaching peak hp, going to a larger TB is not going to do much. It is already getting all the air it can use. So most people do this in conjunction with other mods., like heads/cam. or headers. Maybe you should post in the Forced Induction sect.