My buddies ran the LSX series, 315 Drag Radial. I helped Andy Essary starting around 2013 and then Anthony Manna, both Chicago area guys. Class started out in the 7.80's, went 1/8th, and by the end of the field was running mid 4.20s to mid 4.30s.
I've had other friends who run Xstreme Street, Nitrous Pro Street, X275.
I won't be running any classes in this car, getting it out for the first time this year. I hope to get down to into the 5.40's within 40 passes.
Edit: I'm friends with Bill Trovato and Eric. Bill runs Xstreme Street.