I've run Bosch iridium's in all my vehicles (boosted and daily). No gapping needed.
I just replaced mine, at 80k, with Denso PLatinums. The same brand as the stock plugs.
Denso Iridium 1 step colder plugs. Running great on my 2017 Jetta 1.4T
Get the oem denso ones. There is nothing better than oem for that kind of thing.
This is what a 202k mile spark plug looks like on an 2013 Lexus gs350 daily driver. Pretty impressed with it overall. All 6 plugs look exactly like this.
For spark plugs, denso or bust
I've been running Denso (5346) IKH24 Iridium gapped .024 on APR stg1 for 48k miles and most recently on stg 2 with no issues.
I ran them for awhile in my Passat VR6.They did decent.Burned really well actually. I think when I was running them I only got about 23 MPG.
If you use anything but OEM plugs in a stock white block, well just don't do that. Also Bosch Platinum, great for having to pull your head and find out what the center of the plug did to your engine
I tried the denso IK20 and had nothing but misfires.
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