i just started making mods to my z. already i put header,test pipes,exhaust,intake.but now i want to put AAM Angled Plenum Spacer but do i need to make a ecu reflash if not what could happen to my z?

thanks a lot

 

You don't need to reflash but getting a reflash or tune could help make more power.

 

My Z has no ECU tune and runs fine.