I recently completed a stage 1 upgrade on my new to me 2005 Road King. The it came from the previous owner with 4" V&H Slip Ons but everything else remained stock. I replaced the stock oval AC with a V&H VO2 AC, then I removed the "Y" pipe and replaced the stock headers with the Full Sac True duals. Luckily the computer was left stock so it was not locked out by some other tuner program and Ed with "The Dyno Difference" did his thing last Saturday. Ed has been very helpful and informative thru the process and I can't say enough good about his customer service to do him justice. If you need your bike tuned I highly recommend talking to Ed. The stumbling and stalling I was experiencing at low speed is gone and it pulls hard on the big end when you roll on the throttle.