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Well it was pretty quick for me as I am down 1 cat. Give it a couple weeks. The tips will turn black inside then you'll know. It'll get more and more coated as time goes by.
If that still doesn't fit for you, I'd a get a front pipe with a helmholtz resonator. Nameless Performance makes one. I would advised if you do this, take your car to a GOOD muffler shop and have them make a 2.5" mid pip with a silencer. I say this because I originally put my muffler delete on first and it added a kick in the pants. When I put on the overpipe and front pipe, I feel like I lost some power. After watching a very informative video on exhaust design, I think it added a vacuum pulse that wasn't there before and jacked it all up.
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