for some people they work, for others they don't..

Depends on the situation and supporting mods. If the exhaust mod is all you have done so far and don't plan on spending lots of money modding your car, I wouldnt worry about headers...

If you want more power/better performance down the track a bit, consider a complete sti twin scroll turbo/header bolt-on kit.

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K.E.R.S!!!1