Owner reviews for spark plug

I was looking at pictures of the V12 engine found in the Toyota Century. Then I noticed the spark plug/coil arrangement: Interesting.

Replaced spark plugs with genuine VW Bosch units

I have the similar motor as the 740 you posted. These cars are super simple to work on and nothing major really goes wrong with them. If you do run into issues you can find DIY help on the internets and parts are dirt cheap.

As for the plugs, I bought [these NGK plugs]

NGK spark plugs are fine.

Been running NGKs in Sportsters forever with no issues. Good plug.

Denso IKH24 plugs gapped to 0.024". 6,900 miles. APR Stage 2 tune. Only issue was CEL error when we installed the Unitronic downpipe and flashed to the stage 2 tune. After troubleshooting and contacting APR, they had my shop re-flash to a stage 2 beta file, no more CEL error.

I have tested the BCPR7EIX which did not make any difference to my car. I felt that the standard plugs worked well vs these.

Replaced the plugs -- BKR8EIX per the hstuning blog. I'm still getting the misfires...

I'm Stage 2+ with r8 coil packs and ngk BKR7EIX and still get misfires. I'm not happy about it and I'm not sure what to do.