A local high-end performance shop where I live talked me out of putting a Roto Fab on my trail boss lt 5.3. He even talked me out of a custom exhaust! They said the exhaust is just noise and a cold air intake without a tune is just eye candy under the hood. So, I guess I’m going to leave my truck stock. I was trying to give them my money but they told me without a tuner on the motor, the cold air intake would not be helpful. I do not often raise my hood just to stare at the engine, so I think I will take that $500 and spend it elsewhere.