Easiest of all to install was our new Ford Racing aluminum driveshaft-just slide it in and bolt it up with the stock bolts. Curious, we first pulled out the bathroom scale and found the stock shaft checked in at 19 pounds, the FRPP aluminum replacement at 14 pounds, so we saved 5 pounds right here. After the driveshaft, the exhaust can be hooked up. Expect a different fit with new headers. We ended up with a small leak our muffler shop cured by cutting and re-clocking the belled end on the right X-pipe-to-header flange. A common fix, says Ricardo.