I thought that the i and d were the same back boxes.
Obviously you've had a trial fitment!
According to Supersprint, there is a difference between E90/91/92/93 in that E92/3 have slightly longer tail pipes than E90/91 by about 35mm.
I looked into this for my previous E91 - the Supersprint boxes are the same part number between the i and d (or they were), it's just the tail pipes that differ.
Maybe Eisenmann do it differently to the Italians!
And yes, I still have the Supersprint boxes in my garage . . . Not for sale though.
IIRC back to my college days, +3dB is half as loud again. Nice. Just what the diesel needs - a bit of throatiness.
Mike
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