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In my experience they have very heavy backboxes and rather large too so getting it to sit right is a problem but it sounds the nuts albeit not quite as loud as I would like it.
I hava a Ktec/Janspeed cat back system for my 182 and I love it, its quite loud but I think it sounds the nuts and don't mind at all. I never found any of it heavy either, it must have been half the weight of my standard one.
rather than doing the cat back system, why not, spend about £60 to get some stainless pipe to run through the mid section, wiping out the mid box and 2nd catalyst, sounds the nuts, cheaper, and can be loud if you want it to be ie flaw it
The one I've got on my 172 sounds brilliant. Obviously yours is for a 197 though, so will no doubt sound different.
I'd suggest getting one and if you don't like it, sell it someone else. Won't lose much then.