| I made 330 rwhp HP with stage 3 + mods and gutted pre cats @14.psi The 381 is stage five plus @ 17psi and 16 degrees of timing, they just never updated the description. I don't know too much about the cars around 415 I know one was a higher compression rebuild and advance timing, the other two I know had AFC and a lot of other mods I think one guy had a intercooler mister as well. All the dynos that I have seem usually come in at what everyone else through out the country makes with like modded Z's

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