Query Runs 10x Slower In Asp.net Than In Management Studio - Any Ideas?

We're on SQL 2005 SP1, IIS6, ASP.NET 2.0
Data access is 3 tier (.xsd, BLL) similar to the data tutorials.

From SQL Profiler:
ASP.NET
exec dbo.SpGetCatalogCategories @Show='Children',@ServiceId=31016,@BrandId=NULL,@CategoryId=NULL,@ParentId=10028,@ApplicationId=NULL,@ShowUniversal=1
Event Class: RPC:Completed 
CPU: 5,109
Reads: 613,174
Writes: 0
Duration: 5,133
Management Studio
exec dbo.SpGetCatalogCategories @Show='Children',@ServiceId=31016,@BrandId=NULL,@CategoryId=NULL,@ParentId=10028,@ApplicationId=NULL,@ShowUniversal=1
Event Class: SQL:BatchCompleted
CPU: 407
Reads: 2,182
Writes: 0
Duration: 409
I can post the SP if it will help.

This is in a production enviroment and any help is greatly appreciated.
kyle