It looks like the 2008.5 King of the Road with 540 hp and 520 torque gets that extra power from a revised intake and tune. I may be wrong, but I think that's the only significant difference between that motor and our GT500's. If that's the case does anyone have any info on availability and pricing of the kits? My mods are mostly mini-mods (axle-back, lowering springs) but I'd like to add this one at some point in time. Yes, I know the JLT and other tunes will net more, but I prefer to keep it all Ford or Shelby with my upgrades.