just bought a legacy, has a cnt catless dp and also Stage 2 cobb OTS map. dont really like the smell when its idling and if i step on it it makes its way into the cabin as well. I dont hear any exhaust leaks but its possible a gasket is loose as well.
from what i gather i might be much better off with a protune and this will help reduce the smell. i was also thinking of having a hi flow cat welded in.