Join Date: Jun 2000
Location: Chandler, AZ, USA
Most are relatively inexpensive (about $50.00) and will add from 1 to 5 HP through the mid range.
When i ran my ZX6E i gained 3 solid HP from 4,000 through about 9,000rpm. Top end and bottom end stayed the same.
This may not be what YOU get out of your Katana, but you should expect something similar. Rideability should definatly improve, if not just a slight amount.