Ok I see alot of discussion about Power commander or Fuel controller mods. I hear and understand if you replace your exhaust, it is advised to purchase a Fuel or power commander unit(Fi2000r? I think). Anyway, my Fury came with Cobra Swept pipes. Does my bike have this Power unit or do I need to get one? Second, I want a spike, so by not having one, Do I need a flow/power/fuel unit now when I buy the Spike? Feed me strong advice.