wow i'm surprised it a stick 4 dr! w00t w00t! do you have fifth gear? lol some GA's didn't come with a number 5 lol. also, look on the block in the front of the engine near the header i can't remember if its to the left or right, but its close by there it should say either SR20 or GA16.... or just post an engine bay pic and i'll tell you lol