The only thing left on my 95 that it left the factory with is the bare body shell and the odometer. Everything you can unbolt has been swapped with performance parts, jdm parts or better stock parts from other subarus. Is that modified enough? It's great daily driver never a problem.
Just don't do stupid stuff that's annoying on the street, like super stiff coilovers, loud fartcan or any of that hellaflush garbage. Instead do nice matched strut/spring combos, a catted stealthback with a stock muffler and sticky stock sized tires.