The Supersprint back box is loud, no 2 ways about it! Particularly on cold start, very raw sound indeed.
I've done a fair few motorway miles in a track prepped M3 though, and beyond a slight drone I cant say it bothered me that much. It was mostly noticable on acceleration. Its all down to personal preferrence at the end of the day. I know this particular car has race cats, and only just slips under the 105db test at circuits.
Its only a 1/2 hour job to slip it on (assuming the flanges are in reasonable condition), might be worth doing and see how you go.
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