I installed the Denso Iridium IK22's a couple of weekends ago, and i love them! They are 1 heat range colder than stock, i changed them out at 30k... The stock plugs were definitely gone, installation took 1hr. After i changed them out, the car ran tremendously smoother, and the car seemed more responsive all together.
The plugs that came with our cars from the factory were the Bosch FR8LDC.
I swapped plugs last night and so far no more battery light. I am now on the correct bosch supers While I was getting the flashing battery light I was running bosch supers 2 ranges colder.
After I replaced mk Denso Iridium IK22's with the bosch coppers the problem disappeared. It looked as if the electorodes on 2 of the Denso's were oddly eroded and were probably causing a misfire.
I have had exellent results and will probably run nothing but them
I've had luck with Bosch Platinum+4, and also Denso Iridium plugs. My advice to you is just stay away from the cheap stuff. Like "Wally's discount Spark plugs." Stock wires do just fine with any plug for your car.
i needed to upgrade, all i could get my hand on were the Bosch Platinum 4's and im highly pleased. I noticed the very meager difference immediately when it came to the power. Also, i noticed a marginal difference in the gas mileage as well.
I've run the platinum +4s in my GTI and I haven't had any problems but I haven't found them to feel any different than any other plug.
Just be careful with the Denso plugs. Denso has the gap specified incorrectly in the database so the gap is larger than they should be. It'll run but my cause to long term problems such as coilpack failure.
They don't know how to make a good spark plug.
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