With all the shake up in the tuning world been looking at options to learn and tune myself. Is anyone using a stand alone unit on our cars? I did find this one Holley offers. Sounds like it has a lot of bells and whistles. Holley- HP EFI 4V Modular 4.6/5.4 System How easy is this something like this to learn and use? The more I thought about it it seemed like maybe spending a bit up front may save a lot down the road. Having the ability to retune myself after future mods is a big plus to me.