From the moment I saw the S197's two-piece driveshaft, I was scratching my head. It seemed like a lot of weight and complexity in the name of improving NVH. In fact, after adding the Steeda suspension to my car, the stock driveshaft actually made a tick-tock noise when I got on and off the throttle because of the innate slack of its two-piece design. Of course, weight is the enemy of performance; so dropping some reciprocating weight while adding durability is always a great idea. After doing some research, I discovered the one-piece aluminum shafts from Axle Exchange (PN MAMTCOBRAST; $739.95) have a great reputation. They are made in the USA with Alcoa 6061 T-6 aluminum, and benefit from Precison Schenck balancing.