GH77 (Gregor) had a modification done to his which sounded pretty good when he came to the 2015 meet. I exchanged a few pms with him concerning what he had done and he used a resonator tube but in this case fitted at right angles to the exhaust tube. This is what he said and there is a link to a photo:
" I do warn you that the system is rather rudimentary and while there is no additional noise at 80-85 it is fairly brutal at 60-70 under light load. All to do with the speed of the exhaust sound waves at certain RPM. The resonator helps a bit but it is all very experimental still as the resonator can only cancel out the drone at a set RPM. I'll explain in detail when we meet up."
https://app.box.com/s/ztqjfkuy6o50yu2mtzyf2dce8wivbeha
I didnt end up meeting up with him and have never progressed any mod myself.
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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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