The two best styles would be Triangle or Tubular weld ins. Those would be the strongest no matter what kind of power your making.
With my old 3rd Gen, and with my Current 4th, I have Spohn Tubular Weld-In Subframes. My 3rd gen Subframes had a trans cross-over bar, but my 4th gen set doesn't.
If I had an assload of money I would have gone with the KB's myself.
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