Should you dyno test a fresh engine and is it worth the time and money? In a word - yes. Yes because professional dyno tuning by JGM Motorsports eliminates all doubt about how much power your engine is going to make. Dyno testing and tuning also proves your engine's reliability because this is the hardest your engine will ever have to work - wide open throttle under a load at high rpm. For approximately $600 a day, it worth every penny for peace of mind and an engine that's ready to fire when you drop it in your Mustang.