Ok you went ELs though, they're meant to assist high rpm more but you lose low range torque.

I'm staying with UELs...the kandos have a ~60 OD pipe which is supposed to flow better than the ~40 OD stock pipe.
I still need to see some facts from someone who has tried the Kando UELs on their 257 to judge if they're worth any further budget raping, headers decision will be left to last anyway, all depending on final build cost.

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06 STi: 337hp @23psi on E85...
06 STi: 309hp @22psi on 98ron...