also subscribing for the same question. Also have a tuned Subaru with Perrin's equal length header and it completely changed the sound of the car. It went from sounded like a a boxer to more of a de-tuned Formula 1 engine. At full howl it's one of the better sounding engines I've ever heard. All equal length headers aren't truly equal length. The Raptor V-6 sounds like crap stock so I would love to see something give it better character.