The seal between the cylinder wall and the piston rings, is one of the critical factors of the performance of your engine. A really good seal, insures the lowest amount of pressure leakage past the rings, which means a higher power output at all RPM ranges. Just changing the rings, in your modern 4 stroke engine, can and will help the power when broken in right, but correctly honing the cylinder will ensure the piston rings will mate completely with the cylinder wall.
We now offer this service to the public, instead of just to the race engine builders.