Berk had theirs on the market before Stillen did. At the time I ordered, the Stillens weren't even available, so that's the main reason many of us went with Berk, I think. As for gains of one over the other, Berk has proven dyno gains. I have yet to see a dyno on the Stillen HFCs, so I can't say if one will have substantially more gains over the other.
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"There are no small accidents on this circuit." -- Ayrton Senna
316.8whp & 248 ft/lbs (Dyno Dynamics) | 319whp & 256 ft/lbs (DynoJet) (04/23/10)
Stillen G3 CAI, CBE, Pulley / F.I. LTH / GTSpec Ladder Brace / Setrab Oil Cooler / UpRev-tuned by Forged Perf.
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