I have run pred's for about 10 years prior to going to an enderle injection. I had two on a tunnel ram on a 427 and run a fogger nitrous system withit as well. They were the best "set it and forget it" type of fuel system I have ever used. Except for maintaining them with some WD-40 after running the motor, they were flawless. Their self calibrating design was spectacular as far as the power that they produced. Coupled with the nitrous it became a killer combo that incredibly well. It has been about 5 years since I have played with one but if your interested I can help in seting one up for your combo.