Is it more pronounced when starting and stopping? If it is, it could be the Shock Mount Bearing Plate.
 Porsche Shock Mount Bearing Plate Kit Front Upper 996 997 986 987 Boxster | eBay
__________________
2003 Boxster S
| 987 Air Box | K&N Air Filter | 76mm Intake Pipe| 996 76mm TB | 997 Distribution T | Secondary Cat Delete Pipes | Borla Muffler | NHP 200 Cell Exhaust Headers |
|