sounds about normal but the is200 is quicker than a prius. nut my first Q would be is someone else getting ahead of you at the lights such a major problem? So what if they do, doesnt mean anything, if someone tries to race then let them, be relaxed and content in the knowledge you have a nice comfortable car and dont need to try prove you are the big swinging richard
but a supercharger is your best option 2nd hand you are looking around 2 - 2.5K. induction kits and exhaust will do nothing to the car in standard form and its doubtful they do anything noticable "real world" even after the normal engine mods (i am happy to be proved otherwise when backed up by dyno charts)