I had an Eaton Posi installed last September, and that was probably one of my best investments. You don't even know it's there until you look in the mirror. No noise at all, even around corners, except for the squall of both tires. The Eaton is really smooth and effective, especially with the new carbon friction discs, not to mention rebuildable. It'll run you about $400 plus installation, but also leave you grinnin' ear-to-ear!