How often have you been pulled over and the police ask you to open up your hood? It only happened to me once, and that was because the officer was into imports and he told me that I did a clean install on the engine.
And a JDM d15b can be easily overlooked, a lot of Civic's from 88-95 (EF's and EG's) have d15b's in them (of course they are variations d15b7 etc.).