Well if it's ported then it's not stock to start. What year is the car? The stock injectors are 550cc, I don't know why there is need for the 880cc injectors. I mean you are only running a SAFC on a stock S5 turbo right? BTW these cars run a little rich & narrowbands are useless. Where do you smell the fuel under the hood, under the car or through the exhaust? Have you checked you plugs & wires? Are you dumping more fuel then you need. Remember FUEL / AIR / SPARK one of these are off. I'm going to assume since it's a turbo car you have a boost gauge, what boost are you running?
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