Leaderboard

Well you have to find some first... legacy headers are easy to get, but they have narrower pipes at the exhaust port side. I had to import mine because no one had any in NZ... at least no one was selling them! Once you have paid for the sump, headers/up pipe, shipping and had the turbo flange modified, you might be spending about the same or more than good aftermarket headers. in my opinion you don't need to hold up the tune for these headers... you can get your tune... change the headers later, and if you are worried just get the tune checked and tweaked if it even needs it.

I had Prova equal lengths on mine. Good header with a stock turbo, honestly I thought they sounded decent too. Had a tendency to crack once I went to a big turbo. Gains were, as described, likely minimal on paper but the car felt nice to drive. I've gone to Legacy Twin Scrolls + up-pipe on the latest attempt at making the car better, had to change sump, dipstick and dipstick guide tube, and the pickup.

I used Subaru v9 STi headers... they are purportedly better than most or all off the shelf aftermarket headers. You have to change the sump and dipstick... oh and the oil pickup and possibly the windage tray... I don't remember changing that though.