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Powerflow is a franchise so you really need to do research into which dealers have monkeys and which have professional exhaust builders. I get all my exhausts made by Top Gear in Aylesbury (although not on the zs yet) and they make excellent quality there. Also give good advice too. When I had them make me a decat system for my 300zx the told me that the Turbo seals would go with a decat but I said do it anyway and a few months later they went (didnt matter as i wanted gt28r's anyway) but most garages wouldn't have said this.
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