HAHAH SIl8TY youre so wrong it hurts brother!!!

RB is like 130 lbs heavier than a KA if youre just motor for motor, but EVERYthing on those cars is heavier, not to mention you have a turbo hanging off the side and a big ol' intake manifold!!

and the transmission!?!?!?! don't get me started on that R30A beast, its like 75 lbs heavier itself!!!
everything on the RB is heavier, i wouldn't be surprised if its closer to 300 lbs difference between stock and RB25, and 150 lbs lighter between stock and SR