Simplier, less additional work, solid, proven, and reliable. The larger kit changes the stroke with the same bore. It requires more engine work and labor. The biggest gain I'm interested in is the torque gain. The hp may go up slightly, but there's a big torque inprovement.
Also, I am not planning to make other major changes like different carbs, cams, etc. and I wanted to keep the airbox. Because I would be paying my dealer to do it, I feel it would be the most bang for the buck to get more of what I wanted. My dealer has done a bunch of them.
