You may want to read Bassani's website. Specifically where it states their catted pipes may cause a check engine light.
http://bassani.com/default.cfm?fuseaction=Catalog.warranty
Quote:
Installation of these products as intended in competition applications may require use of MIL eliminators or O2 simulators to avoid possibly setting a catalyst efficiency code, which will cause illumination of your vehicles' "check engine" light. This is due to the inability of currently available after-market converters to emulate the exact operation of factory OEM converters in late model year OBDII emission monitoring/ control system applications.
Summary: You are SOL.
Get a pair of MIL Eliminators for $29.95 and be done with it. You can't blame Bassani when it specially states on their website that their catted pipes may cause a CEL.
Lastly, why on earth are you taking your car to a dealer when a ton of places scan for free...