As a new owner of a Busa I am planning stage 1,2,3 and all out! 1st stage pipe,air filter and Powercommander mapped. My question, The bike comes with 4 into 2. It works and looks good. I am told a 4 into 1 is alot better...lighter and scavenges exhaust for more power! I like the look of the duals, the muffler upgrade is cheaper and dosn't leave the left footpeg hanging..How much power will I give up with Duals? I am concentrating my power upgrade in the mid range for street performance.Is the 4 into 1 the one to buy?
