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.
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.
new NGK R's (copper) runs better but not 100%
I did the plug change for the first time on my Tig. Pretty easy and took maybe 30 minutes. tricky part was getting the wire harness/clips to release from coil packs. Just be patient and use a small screwdriver. FWiW, I used Autolite Iridium plugs cuz my local NAPA dealer was out of the NGK's and recommended these. The quality was really bad on my set.. The cathode (curved portion of the plug) was significantly off axis, misaligned. One plug was bad enough that I returned it for an exchange. These plugs get high reviews on Amazon, so I kept them in without any problem but will be going back to the OEM NGK's next time. My old plugs looked very good for 45K miles.
I put in NGK PFR7S8EG plugs and man the car ran like absolute CRAP when it was cold. It ran fine, even great when it warmed up but it was so bad when cold that it was virtually un-driveable especially under moderate or hard throttle. I ended up putting the old plugs (Bosch platinum/iridium) back in because it was so bad.
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