As for the spark plugs, both Bosch Iridium and NGK Laser Iridiums are fine, arguably even better than OEM (which are made by Denso, btw).
Pros: better than OEM
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I have a 12 GLI with 82k and just changed my plugs for the first time. Holy cow what a difference. It had been running a little rough and even made it seem like the clutch was slipping on hard acceleration between 3 and 4. I thought it was carbon buildup, but I just had that cleaned up at 60k. The new plugs make it run like new again.
Pros: runs like new again
Cons: running a little rough
Vehicle:
Volkswagen
Mileage: 131200 km
The truck is currently using Autolite XP5245 iridiums. Normally I would go with something from NGK but I figured if the Autolites were a decent price I would get them and they would probably last the life of the truck
Pros: decent price
Part number: XP5245
I either use Delco or NGK. Never had a problem with either of them.
Pros: no problems
OEM plugs are good but NGK iridiums are just as good and cheaper. If your car is stock, which if memory served correctly it is, then use NGK BKR8EIX.
Pros: just as good as OEM, cheaper than OEM
Vehicle:
Volkswagen Passat B6
Part number: BKR8EIX
I just bought my old APR S3+ '03 Jetta back. It's been running these for 12 years. I seem to be fine w/ my AEBs and my BKR7e plugs.
Pros: fine for 12 years
Vehicle:
Volkswagen Jetta
Part number: BKR7E
Im stage 2+ running a .028 if i run any larger of a gap I get these weird misfires under wide open throttle. Kinda feels like the clutch slipping but its not.
Pros: good performance at .028
Cons: misfires at larger gap
Vehicle:
Volkswagen Golf
Just an update for you and a PSA: CHECK YOUR SPARK PLUG GAP ON NEW PLUGS. I too trusted that the iridium plugs that I just bought should've been pre-gapped, but I noticed immediately after a tune-up my gas mileage went to piss. Popped the plugs back out and sure enough each one was well over 1mm .
Cons: gas mileage went down
Recently i changed my spark plugs DENSO IRIDIUM IK22 with NGK BKR7E gapped at 0.28inch-0,70mm. The car became very laggy, the throttle response got worse, much more turbo lag and major lost of power. Also im going back with the Densos.
Pros: null
Cons: very laggy, worse throttle response, more turbo lag, major lost of power
Part number: BKR7E
I've had my 2006 Audi a3 3.2 quattro dsg for 5 years now, and every year or so I will have an issue with a misfire on cylinder 6. It is always cylinder 6. I use the recommended NKG IZKR7B(7563) plugs. I often find that the cylinder 6 plug has a crack on the ceramic insulator around the electrode. On one of the plugs, half of the insulator is missing. Replacing the plug always fixes the misfire. I also noticed most recently when I removed the damaged plug, it was very hard to turn and some of the aluminum from the head has fused to the threads, leading me to believe that the cylinder is getting too hot.
Cons: cracked ceramic insulator, insulator missing, fused to head
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