bumping this thread, import tuner stuck the kelfords in the k20z3 and with an RRC manifold netted 30+hp IIRC. This was the gains over stock tune with DCRH, magnaflow exhaust and stock intake
They did do that. The article isn't online yet, but go pick up the mag. They did the RRC untuned; RRC tuned; then RRC / kelford drop ins untuned; last RRC/kelford cams tunedI wish they would have done the RRC then cams (or vice-versa) to compare gains with each mod. From the last "test" of the Kelford Cams (albeit stage 2) the gains were "bad" (they never posted the results). So, I would say take these gains with a grain of salt.
Best regards,
Rulo