ight guys, just came up on a Si, all original. engines running good, but i'm trying to think what i want to swap into it later. im thinking to just do a usdm engine so i can still smog, maybe a GSR. what you guys think

 

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This is really something you will need to decide it is your car. Opinions are like buttholes everyone has one and they are all different. It is your car there are several good choices out there.