tbh with your arrangement the pipe/sound wave enters the main pipe at 90deg - its a matter of making sure that the reflected wave is in opposite phase when it enters the main pipe however that is achieved. As Gregor said, it was a fairly rudimentary arrangement, arrived at (I believe) by trial and error and, of course, it was a trifle(!) resonant at certain revs!!
Of course your comment on the fact that it must be on both pipes is totally relevant.
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2002 D2 S8 – Ming Blue, Valcona leather, Vavona wood insert, solar sunroof (to be fitted), Heated rear seats, extended leather pack, 18” Avus, ski hatch, Bose, auto dim rear view mirror, rear blind.
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