I have a Tiptronic trans, so my choices are limited. If you have the cash, here you go, no CEL with these.
Porsche Boxster 986 / S NHP 200 Cells Exhaust Headers - Maxspeed-Motorsports
You can run catless headers on a manual and have a tune done that doesn't throw a CEL.
Forget the Fabspeed secondary cat delete pipes, get some Circuit Werks secondary cat delete pipes.
 Circuit Werks Porsche Boxster 986 00 04 2 7 3 2 Test Pipe Cat Delete Testpipe TP | eBay
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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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