The recommendation of the dyno tune is the best advice your going to get. However, I haven't seen any tuners that use the fuelpack. Top 3 in that area are TTS, Powervision, Thundermax.
Listen to some M8s and pick the sound you like and go that route, then get it tuned by a reputable tuner. Done! Then ride the hell out of it
2009 Road Glide. 16 in Vindikta Wild Cats. Aquatic AV, Stinger 700X4 to MMatts, Audiopipe horns.
6900pros in the lids w/ sspn.4 1000d, tuned with DD Audio DSI-2. S&S 106, lifters, push rods and AC. Drago 2. CycleRama 575. Progressive monotones -1in. 12in. HD adjustable rear shocks. Painted inner fairing. Tuned with TTS. Blacked out!