When Jeep unveiled the 470-hp, V-8-powered Wrangler 392 and the subsequent Xtreme Recon (XR) package with 35-inch tires, 4.56 gearing, and upgraded shocks, it was easy to think that “peak Jeep” had been achieved. Sure, there are many ways to make the “ultimate” Jeep Wrangler that involves bigger tires, upgraded axles, and major suspension changes, and there is a place for a Jeep with all these mods. But what about those fans of the Rubicon 392 package, who want more without straying too far from the factory vehicle? Can you build a better Wrangler 392 and keep your warranty? Fortunately, the answer is “yes,” thanks to American Expedition Vehicles, or…