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You will sure like the sound of the duals. I just put the dresser duals on mine and I was amazed how much the stock blocked the sound. You won't notice any difference in power loss. Maybe if you go have it dyno tuned you will see it in the numbers but "seat of pants" won't feel any different.
If your just wanting the heat gone, save the $ and cut the cat out of the bastage.....if your wanting to change sound, heat and performance then change the header. I removed my cat 5k ago and that did the trick for me.