Welcome tot he site, As twolane posted for a bolt in the Zippers and Yuill Bros YB-13 are great cams that were designed specifically for the 03-06 CVO 103 engines. These cams both work very well and am sure that there are several dozens of members here that have used them. Consistantly around the country these cams produced between 100-110 horsepower and 100-115 ftlbs of torque. A good exhaust AC kit, pipes, and probably most importantly tune with these cams make the early 103's come alive. If your looking for more power than that then the heads will need to come off and have some work done to them. In this case you will want to discuss the cam choice with whomever is doing the work on the heads.