ok well an sr20 is the motor that comes i think all 240's in japan (correct if im rong may only be s15's) but yea there strong stock turbo motors that make 205hp stock and for the s13 s14 ect an s13 is the type of 240 you have (89-94) and the s14 is the body style after it (95-98 ) and silvia is a 240 in japan just a few things difer like its rhd and the front end and a few other things but if you want to put some power in you car you can get a sr20det swap done at XAT racing for 4300 for the basic swap.. just ask if you have any other q's