if i buy a aem gsr intake will it fir in a 99 civic si

 

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Yes, but *possibly* it might require a little modification to the vehicle engine bay. I put an Integra intake pipe on my B18B swap in a 98 hatch, I had to cut a hole in the metal behind the headlamp for it to get behind the bumper. I'd just do a short ram and not worry about all that.