Just had a JT Tuning 3" system fitted.
£382 1 muffler no cat system + £98 magnaflow 59959 universal cat + £20 stainless pipe + £24 narrow band clamps 3x + £100 fitting = £624.
The downpipe needs to be massaged a bit to stop it hitting the steering shaft, other than that it fits pretty good. There's around 10-15mm clearance on that rear crossmember, no knocks or bangs. They do cat-back systems with adapters for the stock cat too.
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MY97 940 CD LPT Super Sports Edition 2 Turbo, Midnight Purple, 175,000 miles.