Well to speak of rotational mass, I have little to speak of. The Eagle rods I have for my Ls/vtec are like 30 grams lighter than the stock rods, I have no power steering, no air conditioning, A civic Type R crankshaft pulley, An unorthodox racing under drive pulley for my alternator, Fidanza 7.5 lb flywheel, fidanza cam gears, Crower titanium valve retainers just to speak of weight freed power. Not nearly a majority of what I've got.