Just to let you know that unless you remove the cat and fit a full flow cross over pipe it won't realize a lot more power.
If you don't know how to use tune ECU and download a matching tune from our resources center here then you will need a tuner to look at the AFR for you after you fit the air filter.
I would just call a couple of your local tuners and ask them if they have had experience tuning a Rocket, find one that has and take it to him to check and if necessary tweak your tune or install one from our resources section here and check/tweak the AFR.
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