Keep in mind that bosch and ngk use ass opposite numbering system for heat range. So if you want a cooler plug be aware when selecting between the 2 brands.
For illustration
http://images.tapatalk-cdn.com/15/10/28/245065cd675d2994e9daea44f08caa05.jpg
Jones did you try gapping the plugs different to see how that effected knock. we saw this on the 4.2 some plugs would have more ghost knock then others. Also you could see if you degreed plugs with the strap at 12 oclock it helped. The best plugs were the multi electroid plugs. .25 is very short on the gap. .28 and .25 is a big difference. Stock is .36 right
As for the plugs the tips look like they have white on them so they look like they are running clean
Stock is 0.032 I believe.
I to am going to replace my plugs also as a precaution. I went to the stealership and the part number was
mfg# 101-905-661-G
https://www.ecstuning.com/Audi-B8_S4-Quattro-3.0T/ES2539202/
These are NGK PFR8S8EG.
I think I will try a gap .028 and see how this goes. I am trying to understand plug gap, older plugs, etc. However from what I hear and read.
“reduce .004” for every 50 hp you add" or “every 75-100 hp you add, you should go one step colder on the spark plug’s heat range”
Seems like a bit much to gap every .004 for every 50hp?? however I am noob on the spark plug scene. I think I will run with reducing stock by the .004 total.
PS, I am sure most of you guys are well versed in the DIY. But I came across this guys vid after reading Saxons thread over at AZ.
We have coil pack ignition system so you can open up the gap a little more. The closing of the gap was to originally help keep from plug blow out. But thats just about a thing of the past. The voltage our electric system builds and how much the coil packs puts out makes for less of a concern.
Closing the gap too much can cause ghost knock due to a smaller point of burn. The larger the gap the more the plug spark will arch and give more area for the center of the burn. You dont want to open the gap too much because this too can cause a delay in the arch.
Stock on the 4.2 is .36 I pull it back to .34 and step down a temp. Pulling the colder plugs is a big help as it pulls out heat and helps keep a good burn.
So I wanted to do the .028 however. The wire spark
Knock issue has been fixed. Will try and make track again this weekend.
With just the plug change?
Good luck this weekend.
According to my logs, unbelievable.
Those 9 cold range iridium’s were two years old which totally escaped me when I started running this fall.
Well, good to know.
I’ve got 4 years, but only 22k miles on my plugs. I’m going to go ahead and replace them soon. I probably don’t need to, but it can’t hurt. I’m just trying to decide between the factory NGK double platinums, and the NGK iridiums you are using… I think either will do on my car, and I’ll probably stick with the factory 8 heat range with the 0.028 gap.
I used whatever the OE replacement premium NGK plugs were. They were like $16 each.
Jran- Which one are you gonna go with? OEM or Iridiums? Can you confirm those part numbers for me? I don’t think what I’m pulling is right.
I’m still trying to decide which I am going with. The part numbers for the OEM or same basic plugs from NGK are a little confusing, but here is what I came up with.
OEM are VW/Audi versions of the NGK double platinum. They have several part numbers.
Audi part number: 101905611G (available at Audi or ECS)
NGK part number: PFR8S8EG (you can find these on Amazon or Europaparts)
You will also see NGK PFR8S8EG listed as NGK part number: 94460 (this is what ECS has them listed as and they are cheaper than the OEM version, and you can also find these at auto parts stores).
From what I can tell all of the above are the same basic spark plug, but just listed differently at different places.
NGK Iridium like what Jones is using are NGK part number: BKR8EIX but they may also be listed as NGK part number: 2668 (these are also available on Amazon or at most auto parts stores).
Wait till I hit track this weekend 
wonder what plugs the stg3 kit comes with that they chose to use.
That box looks like it says BKR9EIX, or the same one step colder Iridium plugs Jones was running.
Obviously, copiers.
Where?
Why?
When?
(I already know how)
Milan going to rain tonight so no go tonight. Either Milan or St Thomas tomorrow.
Past weekend I had what I am calling “non-normal” knock, Ran 11.73@119 at both Milan and St. Thomas
Changed my plugs and my issue appears to be resolved. Going to attempt again this weekend.