I honestly can't say if you're low/high or I was low. What I can say is on my 9A 2.0 16v (rough guesstimate 185k miles)... NGK iridium plugs (standard gap)
I was having some stuttering/mis-firing at high boost on the spark plugs so I switched to the NGK BKR7E with a .028 gap. Right away I noticed a huge improvement but I can't help but feel it could be better.
From my own experiences the raceplugs seem to help with misfire happy maps.
Been using the ngk ones for 10K km so far and they work just like oem, no problems, no misfires.
The racing plugs from NGK are exceptionally expensive, their standard Iridium plug is great as well. I wouldn't spend the money on the racing plug... I've tracked my car with the standard Iridium plug extensively and had no issues with plug wear etc. I personally feel that the racing plug is just taking more money out of your pocket for no gain/return.
I currently have them installed and gapped at .025. I don't know if they're making a difference or not but the car is running great so I haven't bothered switching back to stock.
Look out for tensioner. Somewhat large maintenance at 40k intervals. (DSG fluid and filter, haldex fluid). Oil changes every 5-10k. Spark plugs every 40k a good ideal imo as well.
I just switched out a set of Bosch's for the NGK PFR7S8EG's...and to me it's night and day.
NGK BKR7EIX is a popular plug for 1.8T and 2.0T, but it is one step colder in the heat range. Fine for those whom don't see freezing and below temps.
I have the one sided electrode NGKs and it screwd up my mileage. but it seemed to happen once I switched the spark plugs.
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