If you want to try something that sounds a little more aggressive than stock but has supposed performance try a Monza Pacesetter exhaust. They should be around 300 to $350 (catback). They aren't rice at all and offer a sporty edge without attracting attention. I'm pretty sure they have 2.5 inch piping which offers minimal back pressure. I've heard mixed reviews from people with these exhaust systems. Some complain that the pipes don't fit and don't increase performance and others says that its been good to them. Your call but worth a look.