Fiberglass shrinks over time & from resting on a poor fitting trailer. Blueprinting the bottom will always improve the handling & performance. When the boat came in it was running 73 mph. After Blueprinting the bottom & a few other changes it was running 82 plus. The boat did run almost 87 when we ran the kilo with it but that was with hering 6 blade propellers & the motors were jacked up really high. So between the props & motor height that's where the extra speed is.