lol, being boosted you should have abslutely smoked the living crap out of him hands down no questions asked. Either your car isnt running right or you suck at driving or both. lol.
A b16 civic si with intake header exhaust will stil run a 15.0-15.3 all day long depending on driver. Ive yet to see one even go into the 14's with basic bolt ons. It usually takes a decent set of cams, larger intake, large exhaust, and good header for them to go mid to high 14's. lol A turbo b13 even on 7psi, stock motor, stock cams, decent size exhaust, should go no slower than a 14.0@101-103mph on street tires.
Im sorry but something is wrong. I used to smoke b16 civic si's all day long by buslengths with my first se-r, full interior, intake header exhaust, pullies, flywheel, Again by bus lengths.
Id hate to say it but a properly running intake header exhaust de, b13 would have walked you. lol