Just 970 miles later, Alan Barsi and his H-D crew were filling her up with four quarts of 20w-50, slapping in new air and oil filters, and going over the control cables, engine coolant, radiator, and brake system with a fine-toothed comb…er, hex wrench. The chrome and rubber Harley-Davidson Slipstream Heated Hand Grips I selected from the P&A catalog (harley-davidson.com; $270) turned out to be a seriously kickass upgrade over the stock units—aesthetically, anyway. To get heat flowing, spin the dial on the left grip to one of the variable settings, from 1 to 7; automatic monitoring is supposed to adjust to ambient temperatures and maintain a constant level of heat. The Slipstream grips also switch off with the ignition so no worries about draining the battery. Alas, the payoff was less than spectacular during my return ride with mountain temperatures in the mid-30s; even cranked up to 7, I didn't feel like the grips emanated a comfortable amount of heat, and they definitely never got hot, just warm. Either my gloves were too thick (not likely) or the control circuit inside the grips was glitchy. I've tested basic aftermarket heated grips that emitted way more heat, so I have a feeling these particular H-D units are somehow defective.