Running a demon 3.09, I'm also running a full AAD suspension and HHP racing springs, however I will be getting rid of those and ordering a full set of Demon springs, comes on good advice from a Challenger that runs 7's so I'll take his word. I am going from a 29.5 DBR to a 28" Mickey ET Street R. The effective ratio is very close to a 3.09 (I think 3.04...) So that means it's going to scream at launch. I'm one step away from ditching the adaptive suspension and reaching out to reed or menscer.