Now I know that these headers probably don't deliver the power of a DTR, SMSP, or Hytech header. But do they at least deliver good power for their price (~$400)?

 

I think you'd be better off with the JDM DC 4-1 header for that price range.

 

The nice thing about this header is that it is full stainless steel (as opposed to ceramic coated or stainless tubes/mild steel flanges like DC). Also, like the DC and others, it appears to be largely a replica of the actual JDM ITR 4-1.