Guys - Thoughts on throwing kando/ultrex UEL headers into my build vs keeping the stock STi one on?
I've read the multiple threads on them here but can't see if they are effective on the 2.5s, most have them on the 02-05s 2L EJs.

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