well then i think you should open a TRD catalog and see how many bolt ons there are for the 4AG. there are so many options with the stock motor its wouldmake your head spin. everything from turbos to carbs to twincharger setups to full tune N/A. so pretty much whatever you want as far as parts in an MR2 its out there. also the 3SGTE swap only requires different motor mounts which are sold on the forum. so its basically a bolt in job. and all the 1.6 4AG motor may all look alike, but they are all very different. different blocks (there are different ribbed/ported), heads, cams, Intake mani's, pistons, rods, ECU's, trans (some are different and gearing is different as well) etc