I have the outsider also.Pricey but worth it.
The reason I asked about your plugs.If your running towards lean now(light tan plug reading) the much less restrictive can with your other mods could cause dangerously lean conditions.This could open up a whole new "can of worms".
With my K@N,air box mods,Mistral crossover and Supertrapp.The stock ECU was Super lean.Off the chart 17:1 lean!!!The addition of a Power Commander III and Dyno tune took care of the problem nicely(76 RWHP).
If you change the can I would definitely go with the PCIII to optimize performance and probably save the engine from permanent damage.
I started with nothing.....and still have most of it.