[CivicSpoon]

The GS-R was actualy made '92-'93, and yes it's supposed to be a rare find. The only thing I know that changed from the '90-'91 to '92-'93 for the LS was the OBD difference ('90-'91 is OBD0 and '92-'93 is OBD1). I'd assume that there is some kind of compression difference between the motors as well as some other things. And yes the LS, RS, and GS all have the same engines, and have the same exhaust bolt pattern. The GS also had all the power options. I don't know the rest of the answers. I'd assume that it'd be possible to use the h22a injectors since both cars use a resistor box; but I don't know that answer for sure.