yes, its definetly possible to make it stealthy. eg; you can have a black fmic, ces racing exhaust which looks almost exactly like the standard one, an air diversion plate to cover up the intercooler from the top. stock airbox and heatshield to cover up the pipings and turbo (no pods as it makes too much noise). but really, all those stealthy mods does not guarantee you not getting done by cops, ofcouse there are always cops out there that doesnt know what they are looking for lol. but once you get pulled over by highway patrol, i say thats yet lol.
i think i pm you few days ago, i say would be great to discuss it throught that if you wanna to.