Since you have the Tiptronic trans, you are limited in the choice of headers or you will need to do some modifications to get cheaper headers to work with a Tiptronic trans.
These headers here work with no modifications needed.
986 Boxster - Cayman
Personally I would start with intake upgrades.
http://986forum.com/forums/show-tell-gallery/56928-bang-buck-mod.html
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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 |
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