Does boxer exhaust valve rythm reduce exhaust scavenging effect?

[Bebbetufs]

Thank you for the information. My knowledge on this is virtually non-existant. At the moment I'm simply thinking out loud, hoping someone more knowledgable will pick up on it and move it along further. Perhaps we should ask this over in a 911 forum. There seems to be many engine "gurus" in them.

Were to put it can probably be calculated, but the lack of room may make it impractical. I did see a test on x-pipes vs. h-pipes. The difference wasn't great, but the effect was similar. I belive this was on a BMW straight-six. Perhaps an h-pipe could be crammed in at the right spot.