It will still read higher HP minus the outside tires. The outside tires probably didn't even rub but it's a lot of excess wieght that a similarly equiped SRW truck wouldn't have. Think about the guys with similar mods and 37in tires if they went back to stock tires on the dyno they would pick up a few HP. Just something to consider, I still think for the mods it's a little low on the HP.