i run BKR7E at stock gap on stage 2 30psi. no problems at all even in 100 degree heat.
I would strongly recommend using NGK PZFR5J-11 spark plugs. These NGK Laser Platinum plugs are the best option for your 2.5l. Not only are they pre-gapped and ready for installation, but they'll perform great and provide dependable service for several years.
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.
I did swap in Denso IKH24 at APR recommendation. Runs nice and have no issues to share
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.
Had these on my MKV and they made the car smoother too.
Just swapped out some pretty old looking OEM bosch plugs that were gapped at .045 for some reason. Put in PFR6Q at .032\". Didnt notice much of a change.
Plugs I use Platinum plugs on my tuned 1.8t .I tried using bk7re's 3 or 4 times and each time the car ran like crap. I gapped at 028,tried 030 .The engine made less power up top every time by a difference of 2/3 psi.
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