I was thinking about putting the Vance & Hines competition full exhaust on my 09 Night Rod Special. My buddy is a Harley mechanic and owns his own shop (not a dealer). He says I don't need a fuel modification system to put pipes on my bike. Has anyone tried putting full pipes on without changing the stock ecu? I'm just looking for a better sound than the super quiet stock exhaust, and I really like the look of the Vance & Hines 2 into 1 setup.