here's the #s that monte quoted..55 nitrous .47 fuel=100 2 degrees reta. rd..63 nitrous .53 fuel =150 4 degrees retard .71nitous .61 fuel =180 6 degrees retard.thats as big a hit that the kit can safley utilize.he also said 150 2 steps colder on the plugs.the 180 another step colder.....that is for the sniper and superpowershot kits.:burnout:that is with 5 pounds fuel pressure.