I have an 04 RR-HSE and wanted to know whether anyone has done an upgrade or customized their exhaust system on their RR-HSE? If so, what brand was used and how does it sound? Looking to give my RR a bit more aggressive sound to it, but nothing too extreme that will annoy my hearing. If anyone knows of any good shops out here in Southern Cali, don't hesitate to send me an email. Thanks once again. Greatly appreciate it.