Review on NGK 94460 PFR8S8EG Spark Plug: Top Performance in a Single Pack by Brian Samaiyar

Probably fake candles. 200 km driven by car. Loss of power above 4,000 rpm (complete lack of power). My tuner recommended my tuner for my 2011 a6 avant 3.0t - put the old spark plugs back in and the problem was gone. Cannot return now as the return window has expired (by 3 days). I should have guessed the deal was too good to be true since these forks were a few bucks cheaper than all the others. I daresay I've come across a number of fake candles. I also had a similar issue when I bought a fuel filter from Amazon, so it looks like I'll be buying parts from brick and mortar stores from now on until Amazon fixes their quality control issues.