For sale is a custom exhaust with high flow cat for an EG33 swap. Fitment: 2002-2007 Impreza 2003-2006 Forester This will bolt directly to a WRX catback exhaust. O2 sensor ready. Price: $100 picked up in Rochester MN
If you have the factory wheels I would consider something like that. Really the only thing I need from a GC since I think they will clear my 4 pot calipers in the front.