Ok, I dont know about anyone else, but for 2500 dollars more than I have in my set of -1's . I could have afforded to buy a set of predators. We have the jesel 1.6 rockers, 1500+ worth of porting, 2.3 valves, 1.64 springs,ti retainers...ect... If I was doing it again, I would have went predator from the get go and have head to grow in. John