Kid at work has a 6.4 challenger one day we were looking at the kenne bell for it. Seems to make good power like 750 or something like that. For a minute I thought that would be a cool setup in an old car, and maybe cheaper than a hellcat crate? But those G3 cost so much to get setup in the car it's crazy. I say for 10 grand you can do a bb with 440 source stroker with trickflow heads and intake. All new parts, make hellcat power. Of coarse it won't have efi and the driveability.