If you decide to go custom, i found this video that i took awhile ago on the dyno. Its my custom setup that i got going. Its 2inch piping from the middle Cat-back, with a Walker Stainless steel muffler and a dual Xforce tip on it for looks. If you can't find Walker...the same company who makes them is called Lukey Muffler. So Walker/Lukey Brand. Im running stock headers, but i have an AFE intake.
Here's a video of what it sounds like: (Sounds different from inside the car though)
__________________
Mods: 17x7 ANZ Tazer Wheels with 215/40/17 Marangoni Tyres
| AFE Air Intake System
| NST Short Shifter Kit
| NST Shifter Cable Bushing Kit
| NST 10% Underdrive Crank Pulley
| Pedders Sports Springs
| Custom 2inch Cat-Back Walker Muffler with 2.5inch Xforce Twin Stainless Steel Tip
| RS Side Skirts
| RS Euro Spoiler
| YRX Front Lip Spoiler
| TRD Style Front Grill
| 12mm Rear Hub Spacers
| Ultra Racing 23mm Rear Sway Bar