I've only ever used NGK plugs in my girlfriends old 2.5 and my current 2.5 (both cars have a total of 150k miles between them) and have never had a problem. They have also never needed to be gapped. Just take em out of the box and install them.
Just thought I'd come back and post what I found to possibly help others. New coil packs solved the issue. All of them were in pretty rough shape when I took them out. Picked up new packs from the stealer for $60 a piece. Also bought the NGK BKR7E's, Gapped to .28 best I could. Fuel economy has returned thankfully, and low end performance is great. The turbo seems to be building boost a little more easier, and it takes less throttle to get the car accelerating. Can floor it from 2500 rpm to the limiter at 6900 without any hesitation, hiccups or blips in power.
I'm running NGK 1675 PFR7S8EG plugs with OE R8 red top coils with APR Stage 2+ with no miss fires.
When I upgraded to R8 coil packs I swapped plugs to NGK Platinums and did nothing but thread em in and walk away. Nothing but great performance since.
Finished up another swap over the weekend. Runs great. Gapped a new set of BKR5E's to .032" and put them in a buddy's daily driven B4 VR6.
I actually have those exact plugs in mine for about 10K miles now and have not hat any problems.
I have been using them, never had problems. Start up is faster, idle is smoother, throttle feels more responsive.
I miss my NGK V powers. I always ran them in my 1.8T's and changed them every oil change because they were so cheap to buy. Put these in and she's as smooth as butter. Torque profile feels better at partial throttle too. Needless to say I am very happy.
I had NGK PFR6Q and it ran fine. But... now I use the stock NGK plugs
I went out bought the NGK plugs and installed them moments ago. Reset the codes and started the engine. Within 1 minute I had the CEL and the P0351 - P0354 codes.
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