My old GLX didn't like anything but NGK coppers.
i have run the ngk v-power plugs the past couple of years with great results. part number r5671a-9
If you like Bosch plugs, use a 7 heat range. The stock 8 is fine for quick in-town trips at stock <10:1 compression. Older 8v's used 7 with the same combustion chamber and lower compression, with 0.032" gap stock. At 11:1 with a big cam and the same ignition mods, an NGK tech told me to run colder plugs (Bosch 6 equivalent, NGK 7) at 0.035" gap. He sent me a box of NGK race plugs, I gapped them, and my car ran sooooo much nicer. I was using Bosch W7DC and W7DTC (even worse) before.
so right now I'm using ngk bkr7e for a turbo application. i am pretty happy with them.
I would also recommend NGK plugs, they are made in Japan and well worth the money.
I made the switch to NGK over a year ago, and haven't looked back. NGK are all made in Japan, and they're more consistent. Multi-electrode plugs hold too much heat around the center electrode, which increases the probability of detonation. Gapping the plugs is also much tougher to do. The grounds can also hold more garbage and shroud the spark.
I've been researching spark plugs and i believe the oem's in Phaeton are Platinum. I am certainly going to verify that and will change mine to Iridium's. For the purpose of better power, performance, and fuel mileage.
That being said I ran Revo stage 1 and now APR stage 1 and in both cases I've had no issues running the NGK BKR7EIX plugs. I inspect them at a reasonable interval to make sure combustion looks good with them and it appears that they are doing just fine.
I'm flashed with Revo Stage 1 and I run NGK BKR7E plugs gapped to 0.028\". They are 1 range colder and are cheap ($15 for 4 at Lordco if you have a discount). Only downside is that you should regap them every oil change, and change them ever other oil change
I have bosh platnum on there and they look like crap after 2,000-3,000 miles.
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