i had no plans to upgrade. but then i went cruising with a friend and his bike has some nice exhaust that sounds beautiful and i got jealous so im in the market. what exhaust systems will work well, upgrade performance and sound darn good but not ridiculously loud for a 1998 500r ninja? i mean right now my ninja just sounds like a pissed off dirt bike. im wanting a tougher sound i guess. can anyone tell me some good ideas/where to get them/how much its gonna cost?? thanks alot everyone.