I've got an '09 XL1200N, purchased bone stock 1 month ago. It was lacking in the acceleration dept. I added a V&H sideshots exhaust, SE stage 1 AC kit and SE race tuner. That helped very slightly, but not enough. As far as top speed, I'm not too concerned. 90-100 on a bike with no windshield is fast enough for now. But I would really like better throttle response and more speed out of the gate, any suggestions. Again, I'm trying to keep the next set of modifications around $1,000.